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And the aplay -c 2 option does not over-ride the settings aplay picks up from the file information header. So, if your HD TV doesn't accept just one channel of digital input, you cannot use aplay to hear a mono wav file.

However, with the command speaker-test, the -c2 option does work, and sets 2 channels in the digital stream. But note that the command speaker-test seems only to like mono wav files, and seems not to play stereo wav files.

The command aplay plays 2 channel stereo wav files in stereo sound without problem provided they last longer than the time it takes the TV to unmute and remute.

If no sound is being produced, and alsamixer is unable to show you any controls, the GPU may have disabled audio. Run this command to check:.

This issue can be experienced when upgrading the kernel, due to changes in how the device tree defaulting has changed.

This can be unused along with other 'dtparam' settings, on the same line or different lines. Reboot, then check the amixer command again.

Enter the command 'alsamixer' and use the control to check that the volume is up arrow keys and that the output is not muted M key. To install support for sound, type the following from a command line from the command prompt before "startx" or in a terminal window.

By default output will be automatic hdmi if hdmi supports audio, otherwise analogue. You can force it with:. Also note that you may have to add your user to the 'audio' group to get permission to access the sound card.

Between December and February the standard raspbian wheezy distribution, and apt-get upgrade, included pulseaudio. Forum posts suggest that pulseaudio can break alsa.

Whilst some members identify various workarounds, others find only removal of pulseaudio restores sound output. The alsa app included in the standard distribution plays wav files.

If you want to play mp3 files, do the following to install an mp3 player after installing alsa-utils:. By default there are only a few hundred MB free in the 2 GB main partition, which can quickly fill up if you download files.

Also, installing some software may incorrectly create or modify a. Xauthority file in your home directory, causing startx to fail, according to this thread.

Temporarily renaming, moving, or deleting that file may fix the problem. Check and see if the DVI cable is screwed in properly. If that doesn't work then try this section.

The only hardware-accelerated video player is in the XBMC distribution and its command line variant omxplayer.

H is the only hardware-accelerated codec, for playback. No hardware encoding is supported. Additional codecs were not purchased as licensing fees would have increased the R-Pi's price.

Notwithstanding the previous paragraph, omxplayer may be included in some versions of raspbian. It is a command line tool, and happily plays.

Known issue with distro package as of 17th April - there's some missing boot config information. Creating a suitable cmdline. Out of the box, R-Pi graphics don't necessarily fill the whole screen.

This is due to something called "Underscan", and it can be fixed easily. Check the display menu options it may be called "just scan", "screen fit", "HD size", "full pixel", "unscaled", "dot by dot", "native" or "1: Making the R-Pi graphics fill the screen is a matter of experimenting with the numbers you put in the config.

Change the numbers — try jumps of 5 or 10 at a time. Bigger negative numbers reduce the black borders so means less black border than The numbers do not all have to be the same; you can use this feature to centre the display on the screen.

This only affects the framebuffer e. You can make it apply to hardware layers with:. Follow the instructions in the section "Big black borders around small image on HD monitors", but use positive numbers for the overscan settings, for example.

This may be caused by loss of signal on long video cables. The signal level may be increased by changing a configuration parameter. Edit the configuration file; see the instructions at Raspberry Pi configuration file.

At your own risk, you can go up to See Troubleshooting Power Problems. First make sure the display is powered on and switched to the right input before booting Pi.

If you have the Rasbian Wheezy image recommended then try. For a quicker way to force wheezy into booting in safe mode, which doesn't need editing config.

Be very careful not to connect any other pins, especially not pins 1 and 2 3V3 and 5V as doing so, with power on, will damage your PI!

Otherwise, try adding the following line to the configuration file similar to interference case above. A similar problem has occured following the installation of Rasbian Wheezy image "wheezy-raspbian" - the hotplug signal appeared to be no longer detected when a HDMI 3 Port Switcher was in use for the Pi running from that image.

An older, but updated and upgraded image still worked, as did a similar image on the other Pi connected to the switch, but, unless the above override was implemented, the Pi with the new image would only provide a HDMI display when directly connected to the monitor.

The same problem has re-occurred when using that wheezy image with a new in March "Model A" Pi. Also try the following video options:.

Here's a rare cause: A standard HDMI cable has five individual ground wires plus a shield. Some cheap HDMI cables do not implement the individual grounds and just have a common foil shield that's connected to the HDMI plug shells at both ends.

You can tell if an HDMI cable implements the individual grounds by checking for continuity using an Ohmmeter or multimeter.

If it cannot detect an HDMI cable it defaults to using composite output. Therefore, make sure there isn't a HDMI cable connected when you want to use composite output.

Also, the Pi will only auto-detect once, at boot-time. If you want to switch from HDMI to Composite or back you need to reboot or know the appropriate command-line magic.

Here are some things to try. Most TVs will show an image with that, but older PAL European televisions may display only back and white or no image.

A commonly used adapter from Ebay: HERE -- by Pinoccio. The input polyfuse may have tripped. It is self-resetting after it cools down and the polymer re-crystallizes, which can take several hours.

Set the Pi aside and try again later. The GPIO pins connect directly into the core of the ARM processer, and are static-sensitive, so you should avoid touching the pins wherever possible.

If you are carrying a static charge, for example by taking off an acrylic pullover, or walking across a nylon carpet, touching the GPIO pins could destroy your R-Pi, so always earth yourself before touching the pins or anything connected to them.

The test is a bash command line script called gpiotest. The test requires the services of the pigpio library.

For the duration of the test nothing must be connected to the gpios no LEDs, wires, ribbon cables etc. The test checks that each gpio may be read and written and that the internal resistor pull-ups and pull-downs are functional.

A video showing what happens to the gpios during a test. A logic analyser or a digital waveform viewer is a very useful tool to diagnose problems with the gpios.

A video of a capture session. It sticks up and due to the small surface-mount pads, it is easy to break off; several people have done so.

If you like, you can solder it back on, or just leave it off. If you do solder it back on, take care to observe the correct polarity with the black stripe towards the board edge.

This part, C6 is a "just in case" component which is good design practice to include, but as it turns out most power supplies still work OK without this part installed.

This part is also discussed here. When trying to install a software package using the command sudo apt-get install xxxx you may see the error.

This means that your software list is out of date. Before attempting to install software, you should always make sure that you are using the latest software list by using the commands.

If you think you have a problem with your power supply, it is a good idea to check the actual voltage on the Raspberry Pi circuit board.

Two test points labelled TP1 and TP2 are provided on the circuit board to facilitate voltage measurements. You should see a voltage between 4.

Anything outside this range indicates that you have a problem with your power supply or your power cable. If you have not used a multimeter before, see these [ basic instructions ].

Even if the multimeter shows the correct voltage, you may have some power supply problems. A multimeter only displays the average voltage.

If there are very short-lived dips or spikes in the voltage, these will not be shown by the multimeter. It is best to measure voltage when Pi is busy.

Try to use a basic one. Wifi dongles are also unlikely to work when directly connected. How to test the F3 polyfuse [19].

If the voltage is different by more than about 0. When polyfuses "blow" their resistance increases dramatically, there by limiting the voltage that can pass through them.

If your power problem suddenly appeared after your board was known to be working fine, it is probable the fuse is just "blown" and will return to normal.

Polyfuses recover from the tripped state to near their normal value in a few minutes, but do take some hours to fully recover so leave it unpowered and check it again in a little while.

Also, on a related issue, do note that if you do not power the PI in the "official manner", that is through it's micro-USB port, but use any alternative way such as through the GPIO header, the test points TP1 and TP2 , but also by back-powering it, you are actually bypassing the PI's input polyfuse protection device!

This can have extreme consequences if ever you manage to put more than 6V on the PI, even for a very short period.

As this causes the overvoltage device D17 on the the PI to trigger and short the 5V supply! Without the polyfuse limiting the current through D17, it will burn out, probably melting the PI's enclosure with it, if you have any and possibly causing a fire-hazard.

It will probably also create a permanent short of the 5V supply! So be warned, and if you use back power make sure your hub or its PSU has a fuse to prevent this from happening.

If not, add your own fuse. If you prefer to make your own PSU - see: Power Supply construction - HowTo. Several different boards have been found probably from different assembly lines, and the following tables try to help you identify your board for better troubleshooting.

Look for the date of manufacturing printed with the year and week. In this example year and week 18th:. See a complete list and user feedback here: Back to the Hub.

This page lists the most common problems and suggests some solutions. Multi-meter lead placement for testing the Raspberry Pi F3 Polyfuse. Screens - Cases - Other Peripherals Keyboard, mouse, hub, wifi Retrieved from " https: Density of film is measured on a base 10 log scale and varies between 0.

The density range of negative film is up to 3. Dmax will be the densest on slide film for shadows, and densest on negative film for highlights.

Some slide films can have a Dmax close to 4. Consumer-level flatbed photo scanners have a dynamic range in the 2. Color film compresses its 12 stops of a possible 16 stops film latitude into just 2.

Kodak Vision 3 has 18 stops. So, color negative film scans the easiest of all film types on the widest range of scanners. Because traditional black-and-white film retains the image creating silver after processing, density range can be almost twice that of color film.

This makes scanning traditional black-and-white film more difficult and requires a scanner with at least a 3. High-end photo lab flatbed scanners can reach a dynamic range of 3.

Dedicated film scanners [14] have a dynamic range between 3. By combining full-color imagery with 3D models, modern hand-held scanners are able to completely reproduce objects electronically.

The addition of 3D color printers enables accurate miniaturization of these objects, with applications across many industries and professions.

For scanner apps, the scan quality is highly dependent on the quality of the phone camera and on the framing chosen by the user of the app.

Scans must virtually always be transferred from the scanner to a computer or information storage system for further processing or storage.

There are two basic issues: The file size of a scan can be up to about megabytes for a DPI 23 x 28 cm 9"x11" slightly larger than A4 paper uncompressed bit image.

Scanned files must be transferred and stored. Scanners can generate this volume of data in a matter of seconds, making a fast connection desirable.

Scanners communicate to their host computer using one of the following physical interfaces, listing roughly from slow to fast:.

During the early s professional flatbed scanners were available over a local computer network. This proved useful to publishers, print shops, etc.

This functionality largely fell out of use as the cost of flatbed scanners reduced enough to make sharing unnecessary.

From all-in-one multi-purpose devices became available which were suitable for both small offices and consumers, with printing, scanning, copying, and fax capability in a single apparatus which can be made available to all members of a workgroup.

Battery-powered portable scanners store scans on internal memory; they can later be transferred to a computer either by direct connection, typically USB, or in some cases a memory card may be removed from the scanner and plugged into the computer.

There are many different scanners, and many of those scanners use different protocols. In order to simplify applications programming, some Applications programming interfaces "API" were developed.

The API presents a uniform interface to the scanner. This means that the application does not need to know the specific details of the scanner in order to access it directly.

In practice, there are often problems with an application communicating with a scanner. Either the application or the scanner manufacturer or both may have faults in their implementation of the API.

Typically, the API is implemented as a dynamically linked library. The manufacturer's part of the API is commonly called a device driver , but that designation is not strictly accurate: Rather the scanner API library translates application requests into hardware requests.

This allows batch scans and transparent network access without any special support from the device driver. TWAIN is used by most scanners. Originally used for low-end and home-use equipment, it is now widely used for large-volume scanning.

Although no software beyond a scanning utility is a feature of any scanner, many scanners come bundled with software. Typically, in addition to the scanning utility, some type of image-editing application such as Adobe Photoshop , and optical character recognition OCR software are supplied.

OCR software converts graphical images of text into standard text that can be edited using common word-processing and text-editing software; accuracy is rarely perfect.

Some scanners, especially those designed for scanning printed documents, only work in black-and-white but most modern scanners work in color.

For the latter, the scanned result is a non-compressed RGB image, which can be transferred to a computer's memory. The color output of different scanners is not the same due to the spectral response of their sensing elements, the nature of their light source and the correction applied by the scanning software.

While most image sensors have a linear response, the output values are usually gamma compressed. Some scanners compress and clean up the image using embedded firmware.

Once on the computer, the image can be processed with a raster graphics program such as Adobe Photoshop or the GIMP and saved on a storage device such as a hard disk.

Images are usually stored on a hard disk. Optical character recognition OCR software allows a scanned image of text to be converted into editable text with reasonable accuracy, so long as the text is cleanly printed and in a typeface and size that can be read by the software.

OCR capability may be integrated into the scanning software, or the scanned image file can be processed with a separate OCR program. Document imaging requirements differ from those of image scanning.

These requirements include scanning speed, automated paper feed, and the ability to automatically scan both the front and the back of a document.

On the other hand, image scanning typically requires the ability to handle fragile and or three dimensional objects as well as scan at a much higher resolution.

Document scanners have document feeders , usually larger than those sometimes found on copiers or all-purpose scanners.

Scans are made at high speed, from 20 up to [16] or [17] pages per minute, often in grayscale, although many scanners support color.

Many scanners can scan both sides of double-sided originals duplex operation. Sophisticated document scanners have firmware or software that cleans up scans of text as they are produced, eliminating accidental marks and sharpening type; this would be unacceptable for photographic work, where marks cannot reliably be distinguished from desired fine detail.

Files created are compressed as they are made. The resolution used is usually from to dpi , although the hardware may be capable of [17] or higher resolution; this produces images of text good enough to read and for optical character recognition OCR , without the higher demands on storage space required by higher-resolution images.

Document scans are often processed using OCR technology to create editable and searchable files. Lossy JPEG compression, which is very efficient for pictures, is undesirable for text documents, as slanted straight edges take on a jagged appearance, and solid black or other color text on a light background compresses well with lossless compression formats.

While paper feeding and scanning can be done automatically and quickly, preparation and indexing are necessary and require much work by humans.

Preparation involves manually inspecting the papers to be scanned and making sure that they are in order, unfolded, without staples or anything else that might jam the scanner.

Indexing involves associating relevant keywords to files so that they can be retrieved by content. This process can sometimes be automated to some extent, but it often requires manual labour performed by data-entry clerks.

One common practice is the use of barcode -recognition technology: Using automatic batch scanning, the documents are saved into appropriate folders, and an index is created for integration into document-management systems.

A specialized form of document scanning is book scanning. Technical difficulties arise from the books usually being bound and sometimes fragile and irreplaceable, but some manufacturers have developed specialized machinery to deal with this.

Often special robotic mechanisms are used to automate the page turning and scanning process. Another category of document scanner is the document camera.

Capturing images on document cameras differs from that of flatbed and Automatic document feeder ADF scanners in that there are no moving parts required to scan the object.

Document cameras capture the whole document or object in one step, usually instantly. Typically, documents are placed on a flat surface, usually the office desk, underneath the capture area of the document camera.

The process of whole-surface-at-once capturing has the benefit of increasing reaction time for the work flow of scanning.

After being captured, the images are usually processed through software which may enhance the image and perform such tasks like automatically rotating, cropping and straightening them.

It is not required that the documents or objects being scanned make contact with the document camera, therefore increasing flexibility of the types of documents which are able to be scanned.

Objects which have previously been difficult to scan on conventional scanners are now able to be done so with one device.

Other objects include books, magazines, receipts, letters, tickets etc. No moving parts can also remove the need for maintenance, a consideration in the Total cost of ownership , which includes the continuing operational costs of scanners.

Increased reaction time whilst scanning also has benefits in the realm of context-scanning. ADF scanners, whilst very fast and very good at batch scanning, also require pre- and post- processing of the documents.

Document cameras are able to be integrated directly into a Workflow or process, for example a teller at a bank. The document is scanned directly in the context of the customer, in which it is to be placed or used.

Reaction time is an advantage in these situations. Document cameras usually also require a small amount of space and are often portable.

Whilst scanning with document cameras may have a quick reaction time, large amounts of batch scanning of even, unstapled documents is more efficient with an ADF scanner.

There are challenges which face this kind of technology regarding external factors such as lighting which may have influence on the scan results.

The way in which these issues are resolved strongly depends on the sophistication of the product and how it deals with these issues.

Infrared cleaning is a technique used to remove the effects of dust and scratches on images scanned from film; many modern scanners incorporate this feature.

It works by scanning the film with infrared light; the dyes in typical color film emulsions are transparent to infrared light, but dust and scratches are not, and block infrared; scanner software can use the visible and infrared information to detect scratches and process the image to greatly reduce their visibility, considering their position, size, shape, and surroundings.

Scanner manufacturers usually have their own name attached to this technique. Some independent software developers design infrared cleaning tools.

Flatbed scanners have been used as digital backs for large-format cameras to create high-resolution digital images of static subjects.

Edit Read in another language Image scanner. Drum Edit This section does not cite any sources. Please help improve this section by adding citations to reliable sources.

Unsourced material may be challenged and removed. February Learn how and when to remove this template message.

This part is also discussed here. Preparation involves manually inspecting the papers to be scanned and making sure that bestes spiel für android are in order, unfolded, without staples or anything else that might jam the scanner. Bigger negative numbers reduce the black borders so means less black border than H is the only hardware-accelerated codec, for playback. Reaction time is an advantage in these situations. Views Read View source View history. More often than not, füchse duisburg ticker, the reverse is true with cheap hubs—the Pi draws just enough power backwards from the powered hub to unsuccessfully attempt booting. An image is therefore visible to the detector only because of the light Beste Spielothek in Ebersdorf finden reflects. They typically have a "start" button, which is held by the user for the duration of the scan; some switches to set the optical resolution ; and a roller, which generates a clock pulse for synchronization with the computer. Also, the Pi will only auto-detect once, at boot-time. No moving parts can also remove the need for maintenance, a consideration in the Total cost of ownershipwhich includes the continuing operational costs of scanners. The addition of 3D color printers enables accurate miniaturization of these objects, with applications across many industries and professions. He sees the rise of systems like slot-based intersections as consistent with the way in which online casino februar 2019 infrastructure will continue to migrate from the apple store android space to the private confines of a vehicle.

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A blinking red power LED indicates problems with the power supply. On model A and B, it is hard-wired to the 3. If it is blinking, as one user has reported [1] it means the 5V power supply is dropping out.

Use a different power supply. If it does, the LED will blink. Check your connections, cable, and power supply.

Start off by reading the "Is your Pi not booting? A faintly glowing steady green LED means no boot code has ever been executed , as almost the first thing the boot code does is to turn the faint glow off!

Note also there is a difference between the quad core Pi 2 BCM and the other models if there is no SD card inserted, or the SD card is improperly formatted.

The former will have both red and green lights on bright and steady. The latter will have only the red light on. According to this forum post the green light will blink in a specific pattern to indicate some types of errors:.

Note that 4-flashes may point to a defective SD-card holder, if one or more of the data contacts is intermittent it can lead to this problem.

With current firmware, a coloured splash screen actually its just four pixels "blown up" by the GPU to full screen is displayed after GPU firmware start.

This should be replaced by linux console a second later. However if the coloured screen remains, it suggests the kernel.

Try replacing it with a known good one. Immediately after displaying the splash screen, the PI starts consuming a little more current.

If the PI resets at that moment, it is an indication that the power supply isn't able to deliver the full current your PI requires, but dips its output voltage below a minimum when loaded with the full current the PI needs.

You can open config. Don't forget to 'eject' the card before removing it from the reader. Text appears on screen, but then hangs with debug messages.

This can be caused by USB devices such as keyboards. Try again with nothing in the USB. This is caused by a power supply producing too low a voltage.

This has been reported several times [6] [7] [8] and remains an open issue. Low voltage or an improper SD card can cause it. Some SD cards will work until they warm up slightly, and then fail [9].

When exposed to 21 C room temperature the warmest part of an uncased working R-Pi should be 41 C [10]. The wiki has a list of working SD cards.

This is most often caused by inadequate power. Use a good power supply and a good power cable. Some cheap cables that work with a cell phone, cannot fully power the R-Pi.

Some USB devices require a lot of power: They should be 5v mA each max, any more than this they must be used with a powered USB hub.

Try unplugging every USB device except the keyboard you should also note that some keyboards have built in hubs and can try to draw mA Pi can only handle mA per USB slot without a hub.

Also, use the latest software. Forum user MrEngman reported some keyboard repeats and wireless hangs until upgrading to the debian kernel, which he reports stable with no problems even with a low TP1-TP2 voltage of 4.

One suggested remedy to this, which has some positive feedback, is to adjust the USB bus speed. To do this, you need to edit the cmdline.

Worst case scenario, some advanced keyboards, such as the Roccat Arvo, have kernel modules that need activating. If you have access to another keyboard temporarily, you will need to modprobe the relevent driver.

Or if this is not possible, you can rebuild the kernel instructions available on the wiki page with the modules installed.

Many wireless keyboards are known to have "sticky keys" on the R-Pi. Work has recently summer been done on the USB code.

Updating to a recent firmware might help. Updating the firmware can be done with rpi-update. Recent Raspbian releases comes with rpi-update installed.

On April 30 , there was a bugfix [11] relating to USB sharing between high-speed eg. On , user spennig was pleased to confirm that wifi was working with a USB keyboard and mouse, as long as the Raspberry Pi had a good PSU and a powered hub.

Even so, some experimentation was needed, e. USB WiFi connected to the device, and the keyboard and mouse connected to the powered hub.

Some experimentation may be necessary to find a working combination; however a good power supply is essential. My experience regarding this issue point to interferences in the 2.

Changing the channel on the wireless access point fixed the problem completely. Some wireless keyboards, for example the Microsoft Wireless Keyboard are reported to fail [14] even though the current drawn by the wireless adaptor is within the R-Pi USB spec limit of mA.

This may be a software driver problem. If different letters appear on-screen from that which you typed, you need to reconfigure you keyboard settings.

In Debian, from a command line type:. If you have remapped your keyboard and get a very long delay during the keyboard mapping at startup, type the following once on the command line after you have logged in:.

There has been more than one report [15] [16] [17] of a R-Pi booting but not getting USB input, using a known-good power supply, SD card, and keyboard.

Or return the board for a replacement, but before making this conclusion, confirm known good peripherals. As of June 1 , Eben reported [18] that only about 1 in shipped R-Pi boards have been found to have a hardware fault of any kind.

Use the excellent guvcview program to test your webcam and to change the capture settings. You can improve the frame rate to a great extent by changing the settings.

Using the latest firmware version may help various problems with SD card and display compatibility. Check the kernel version with:.

The GPU firmware and kernel can be updated with Hexxeh's rpi-update tool. However this requires the Pi to be successfully booted.

With sdcard problems, you may not get that far, so can try a manual udpate. If you have a Linux machine, rpi-update can be run on that in an offline mode.

Use this to download rpi-update:. You can download the latest GPU firmware version here. Click on view raw , then save it, and put the new start.

Similarly, the latest kernel is here. After updating these files you should be able to boot. As this noting system was causing trouble if the amount of RAM was not always the same.

Make sure your editor doesn't change the first letter of the line into an uppercase letter, as some editors do. The entry is case sensitive.

Luckily, if you have this problem, most built-in card readers are easy to pull apart and repair; some users have even reported succesfully unjamming the switch with a blast of compressed air from a can into the SD-card slot without having to dislodge anything.

You may also be able to temporarily get round the problem by putting the write-protect tab in a half-way position - this pushes on a different part of the strip and may break the contact - it's worth trying a few, slightly different positions.

This is often caused by inadequate power. More often than not, however, the reverse is true with cheap hubs—the Pi draws just enough power backwards from the powered hub to unsuccessfully attempt booting.

There is an ongoing issue with the Ethernet connection being lost when low-speed devices, such as mice or keyboards are connected via a powered USB hub.

The simplest way to solve this is to connect your mouse and keyboard directly into the 2 USB ports on the R-Pi assuming they draw less than mA apiece.

The LED in the corner of the board labelled "10M" is mislabeled on the rev 1. It is correctly labeled "" on the rev 2. You can confirm the true transfer rate using a network benchmark such as iperf.

You can also read the current network speed with:. In the Debian image, ssh is disabled by default. This is too hot to touch for more than a few seconds, but it is not unusually hot for the chip.

The LAN data sheet in Table 4. It uses mW at 3. Estudio de sus temperaturas en funcionamiento Is the Raspberry Pi computer getting hot?

A study of its operational temperature. The Spanish article has numerous color temperature images of RasPi in various operational modes, with the highest LAN case temperature measured as The USB driver allocates memory from the kernel, and when traffic is very high e.

Crashes with high network load can also be related to your power supply, try a powered usb hub. You should have a line like:.

Try increasing that number to If the above fixes do not work, you can prevent the crashes by limiting the bandwidth This is also working sometimes if the crashes are related to power supply.

The network connection may fail when the command startx is used to enter a Graphical User Interface. As of 1 September , this fault is fixed in the latest firmware.

To load the latest firmware, see http: Please check the page http: While using Debian, some programs may ask for your password but refuse to accept a valid password.

This is a fault in old Debian images previous to September If you are using an image with this fault, upgrade to a more modern image or enter the following command on the command line.

Please enter this command carefully, the spaces are important. The command should be accepted without any response or errors.

There is no root password set by default on Debian. You are expected to do everything through sudo. You can set one with "sudo passwd root" - just make sure you know what you are doing with a root account.

Firstly, it seems that some HD TVs mute audible sound output when there is no digital input, and slowly fade the sound up and down at the start and end of digital input.

This means that short duration sounds will not be heard. A work around is to play longer duration wav files.

Secondly, it seems that some HD TVs mute audible sound output when there is only one channel of digital input. ALSA aplay uses the file information header to configure its digital output.

And the aplay -c 2 option does not over-ride the settings aplay picks up from the file information header. So, if your HD TV doesn't accept just one channel of digital input, you cannot use aplay to hear a mono wav file.

However, with the command speaker-test, the -c2 option does work, and sets 2 channels in the digital stream. But note that the command speaker-test seems only to like mono wav files, and seems not to play stereo wav files.

The command aplay plays 2 channel stereo wav files in stereo sound without problem provided they last longer than the time it takes the TV to unmute and remute.

If no sound is being produced, and alsamixer is unable to show you any controls, the GPU may have disabled audio.

Hand-held scanners , where the device is moved by hand, have evolved from text scanning "wands" to 3D scanners used for industrial design, reverse engineering, test and measurement, orthotics , gaming and other applications.

Mechanically driven scanners that move the document are typically used for large-format documents, where a flatbed design would be impractical. Modern scanners typically use a charge-coupled device CCD or a contact image sensor CIS as the image sensor, whereas drum scanners , developed earlier and still used for the highest possible image quality, use a photomultiplier tube PMT as the image sensor.

A rotary scanner, used for high-speed document scanning, is a type of drum scanner that uses a CCD array instead of a photomultiplier.

Non-contact planetary scanners essentially photograph delicate books and documents. All these scanners produce two-dimensional images of subjects that are usually flat, but sometimes solid; 3D scanners produce information on the three-dimensional structure of solid objects.

Digital cameras can be used for the same purposes as dedicated scanners. When compared to a true scanner, a camera image is subject to a degree of distortion, reflections, shadows, low contrast, and blur due to camera shake reduced in cameras with image stabilization.

Resolution is sufficient for less demanding applications. Digital cameras offer advantages of speed, portability and non-contact digitizing of thick documents without damaging the book spine.

As of [update] scanning technologies were combining 3D scanners with digital cameras to create full-color, photo-realistic 3D models of objects.

In the biomedical research area, detection devices for DNA microarrays are called scanners as well. The detection is done via CCD or a photomultiplier tube.

Modern scanners are considered the successors of early telephotography and fax input devices. It used electromagnets to drive and synchronize movement of pendulums at the source and the distant location, to scan and reproduce images.

In Europe, services similar to a wirephoto were called a Belino. It was used by news agencies from the s to the mids, and consisted of a rotating drum with a single photodetector at a standard speed of 60 or rpm later models up to rpm.

They send a linear analog AM signal through standard telephone voice lines to receptors, which synchronously print the proportional intensity on special paper.

Color photos were sent as three separated RGB filtered images consecutively, but only for special events due to transmission costs. Drum scanners capture image information with photomultiplier tubes PMT , rather than the charge-coupled device CCD arrays found in flatbed scanners and inexpensive film scanners.

Modern color drum scanners use three matched PMTs, which read red, blue, and green light, respectively. Light from the original artwork is split into separate red, blue, and green beams in the optical bench of the scanner with dichroic filters.

The smaller dynamic range of the CCD sensors, versus photomultiplier tubes, can lead to loss of shadow detail, especially when scanning very dense transparency film.

The drum scanner gets its name from the clear acrylic cylinder, the drum, on which the original artwork is mounted for scanning.

The sample size is the area that the scanner encoder reads to create an individual pixel. The aperture is the actual opening that allows light into the optical bench of the scanner.

The ability to control aperture and sample size separately is particularly useful for smoothing film grain when scanning black-and-white and color negative originals.

While drum scanners are capable of scanning both reflective and transmissive artwork, a good-quality flatbed scanner can produce good scans from reflective artwork.

As a result, drum scanners are rarely used to scan prints now that high-quality, inexpensive flatbed scanners are readily available. Film, however, is where drum scanners continue to be the tool of choice for high-end applications.

Because film can be wet-mounted to the scanner drum, which enhances sharpness and masks dust and scratches, and because of the exceptional sensitivity of the PMTs, drum scanners are capable of capturing very subtle details in film originals.

The situation as of [update] was that only a few companies continued to manufacture and service drum scanners.

While prices of both new and used units dropped from the start of the 21st century, they were still much more costly than CCD flatbed and film scanners.

Image quality produced by flatbed scanners had improved to the degree that the best ones were suitable for many graphic-arts operations, and they replaced drum scanners in many cases as they were less expensive and faster.

However, drum scanners with their superior resolution up to 24, PPI , color gradation, and value structure continued to be used for scanning images to be enlarged, and for museum-quality archiving of photographs and print production of high-quality books and magazine advertisements.

As second-hand drum scanners became more plentiful and less costly, many fine-art photographers acquired them. This type of scanner is sometimes called a reflective scanner because it works by shining white light onto the object to be scanned and reading the intensity and color of light that is reflected from it, usually a line at a time.

They are designed for scanning prints or other flat, opaque materials but some have available transparency adapters, which for a number of reasons, in most cases, are not very well suited to scanning film.

CCD-type scanners typically contain three rows arrays of sensors with red, green, and blue filters. Contact image sensor CIS scanning consists of a moving set of red, green and blue LEDs strobed for illumination and a connected monochromatic photodiode array under a rod lens array for light collection.

An image is therefore visible to the detector only because of the light it reflects. Transparent images do not work in this way, and require special accessories that illuminate them from the upper side.

Many scanners offer this as an option. This type of scanner is sometimes called a slide or transparency scanner and it works by passing a narrowly focused beam of light through the film and reading the intensity and color of the light that emerges.

Some models are mainly used for same-size scans. Film scanners vary a great deal in price and quality. From there they inch up in staggered levels of quality and advanced features upward of five figures.

Scanners are available that pull a flat sheet over the scanning element between rotating rollers. Some are portable , powered by batteries and with their own storage, eventually transferring stored scans to a computer over a USB or other interface.

Hand scanners are moved over the subject to be imaged by hand. There are two different types: Hand-held document scanners are manual devices that are dragged across the surface of the image to be scanned by hand.

Scanning documents in this manner requires a steady hand, as an uneven scanning rate produces distorted images; an indicator light on the scanner indicates if motion is too fast.

They typically have a "start" button, which is held by the user for the duration of the scan; some switches to set the optical resolution ; and a roller, which generates a clock pulse for synchronization with the computer.

Older hand scanners were monochrome , and produced light from an array of green LEDs to illuminate the image"; [7] later ones scan in monochrome or color, as desired.

A hand scanner may have a small window through which the document being scanned could be viewed. In the early s many hand scanners had a proprietary interface module specific to a particular type of computer, such as an Atari ST or Commodore Amiga.

Since the introduction of the USB standard, it is the interface most commonly used. As hand scanners are much narrower than most normal document or book sizes, software or the end user needed to combine several narrow "strips" of scanned document to produce the finished article.

Inexpensive portable battery-powered "glide-over" hand scanners, typically capable of scanning an area as wide as a normal letter and much longer remain available as of [update].

Handheld 3D scanners are used in industrial design, reverse engineering, inspection and analysis, digital manufacturing and medical applications.

Image scanners are usually used in conjunction with a computer which controls the scanner and stores scans. Small portable scanners, either roller-fed or "glide-over" hand -operated, operated by batteries and with storage capability, are available for use away from a computer; stored scans can be transferred later.

Many can scan both small documents such as business cards and till receipts, and letter-sized documents.

The higher-resolution cameras fitted to some smartphones can produce reasonable quality document scans by taking a photograph with the phone's camera and post-processing it with a scanning app, a range of which are available for most phone operating systems , to whiten the background of a page, correct perspective distortion so that the shape of a rectangular document is corrected, convert to black-and-white, etc.

Many such apps can scan multiple-page documents with successive camera exposures and output them either as a single file or multiple page files.

Some smartphone scanning apps can save documents directly to online storage locations, such as Dropbox and Evernote , send via email or fax documents via email-to-fax gateways.

Color scanners typically read RGB red-green-blue color data from the array. Color depth varies depending on the scanning array characteristics, but is usually at least 24 bits.

High quality models have bits of color depth. Another qualifying parameter for a scanner is its resolution , measured in pixels per inch ppi , sometimes more accurately referred to as Samples per inch spi.

Instead of using the scanner's true optical resolution , the only meaningful parameter, manufacturers like to refer to the interpolated resolution , which is much higher thanks to software interpolation.

As of [update] , a high-end flatbed scanner can scan up to ppi and drum scanners have an optical resolution of between 3, and 24, ppi.

The effective resolution of most all consumer flatbed scanners is considerably lower than the manufactures' given optical resolution. Manufacturers often claim interpolated resolutions as high as 19, ppi; but such numbers carry little meaningful value, because the number of possible interpolated pixels is unlimited and doing so does not increase the level of captured detail.

The size of the file created increases with the square of the resolution; doubling the resolution quadruples the file size.

A resolution must be chosen that is within the capabilities of the equipment, preserves sufficient detail, and does not produce a file of excessive size.

The file size can be reduced for a given resolution by using "lossy" compression methods such as JPEG , at some cost in quality.

If the best possible quality is required lossless compression should be used; reduced-quality files of smaller size can be produced from such an image when required e.

Purity can be diminished by scanner noise, optical flare, poor analog to digital conversion, scratches, dust, Newton's rings , out of focus sensors, improper scanner operation, and poor software.

Drum scanners are said to produce the purest digital representations of the film, followed by high end film scanners that use the larger Kodak Tri-Linear sensors.

The third important parameter for a scanner is its density range Dynamic Range or Drange see Densitometry. A high density range means that the scanner is able to record shadow details and brightness details in one scan.

Density of film is measured on a base 10 log scale and varies between 0. The density range of negative film is up to 3. Dmax will be the densest on slide film for shadows, and densest on negative film for highlights.

Some slide films can have a Dmax close to 4. Consumer-level flatbed photo scanners have a dynamic range in the 2. Color film compresses its 12 stops of a possible 16 stops film latitude into just 2.

Kodak Vision 3 has 18 stops. So, color negative film scans the easiest of all film types on the widest range of scanners. Because traditional black-and-white film retains the image creating silver after processing, density range can be almost twice that of color film.

This makes scanning traditional black-and-white film more difficult and requires a scanner with at least a 3. High-end photo lab flatbed scanners can reach a dynamic range of 3.

Dedicated film scanners [14] have a dynamic range between 3. By combining full-color imagery with 3D models, modern hand-held scanners are able to completely reproduce objects electronically.

The addition of 3D color printers enables accurate miniaturization of these objects, with applications across many industries and professions.

For scanner apps, the scan quality is highly dependent on the quality of the phone camera and on the framing chosen by the user of the app.

Scans must virtually always be transferred from the scanner to a computer or information storage system for further processing or storage.

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