Section: SANE Scanner Access Now Easy (5)
Updated: 11 Jul 2008
The sane-epson library implements a SANE (Scanner Access Now Easy) backend that provides access to Epson flatbed scanners. Some functions of this backend should be considered beta-quality software! Most functions have been stable for a long time, but of course new development can not and often times will not function properly from the very first day. Please report any strange behavior to the maintainer of the backend.
At present, the following scanners are known to work with this backend::
Model: Connection Type --------------------------- ------------------- GT-5000 SCSI, parallel GT-6000 parallel GT-6500 SCSI (use only the line "scsi" in epson.conf) ActionScanner II SCSI, parallel GT-7000 SCSI Perfection 636 SCSI Perfection 636U USB Perfection 610 USB Perfection 640 USB Perfection 1200S SCSI Perfection 1200U USB Perfection 1240 USB, SCSI Perfection 1640 USB, SCSI Perfection 1650 USB Perfection 1660 USB Perfection 2400 USB Perfection 2450 USB, IEEE-1394 Expression 636 / GT-9500 SCSI Expression 1600 USB, SCSI, IEEE-1394 Expression 1680 USB, SCSI, IEEE-1394 CX-3200 USB CX-5200 USB
and many more. The official list is on the Sane web site.:
For other scanners the software may or may not work. Please send mail to the backend author ([email protected]) to report success with scanners not on the list or problems with scanners that are listed.
The options the backend supports can either be selected through command line options to programs like scanimage or through GUI elements in programs like xscanimage or xsane.
Valid command line options and their syntax can be listed by using
- scanimage --help -d epson
Not all devices support all options.
- Scan Mode
- The --mode switch selects the basic mode of operation of the scanner. Valid choices are Binary, Gray and Color. The Binary mode is black and white only, Gray will produce 256 levels of gray or more depending on the scanner and Color means 24 bit color mode or more depending on the scanner. Some scanners will internally use 36 bit color, their external interface however may only support 24 bits.
The --depth option selects the bit depth the scanner is using. This option is only available for scanners that support more than one bit depth. Older scanners will always transfer the image in 8bit mode. Newer scanners allow to select either 8 bits, 12 or 14 bits per color channel. For a color scan this means an effective color depth of 36 or 42 bits over all three channels. The valid choices depend on the scanner model.
The --halftoning switch selects the mode that is used in Binary mode. Valid options are "None", "Halftone A (Hard Tone)", "Halftone B (Soft Tone)", "Halftone C (Net Screen)", "Dither A (4x4 Bayer)", "Dither B (4x4 Spiral)", "Dither C (4x4 Net Screen)", "Dither D (8x4 Net Screen)", "Text Enhanced Technology", "Download pattern A", and "Download pattern B".
The --dropout switch selects the so called dropout color. Valid options are None, Red, Green and Blue. The default is None. The dropout color is used for monochrome scanning and selects the color that is not scanned. This can be used to e.g. scan an original with a colored background.
The --brightness switch controls the brightness of the scan. Valid options are integer values from -3 to 3. The default is 0. The larger the brightness value, the brighter the image gets. If a user defined table for the gamma correction is selected, the brightness parameter is not available.
The --sharpness switch sets the sharpness of the image data. Valid options are integer values from -2 to 2, with -2 meaning "Defocus", -1 "Defocus slightly", 0 "Normal", 1 "Sharpen slightly" and 2 "Sharpen".
The --gamma-correction switch controls the scanner's internal gamma correction. Valid options are "Default", "User defined", "High density printing" "Low density printing" and "High contrast printing".
The --color-correction switch controls the scanner's internal color correction function. Valid options are "No Correction", "Impact-dot printers", "Thermal printers", "Ink-jet printers" and "CRT monitors". The default is "CRT monitors".
The --resolution switch selects the resolution for a scan. Some EPSON scanners will scan in any resolution between the lowest and highest possible value. The list reported by the scanner can be displayed using the "--help -d epson" parameters to scanimage.
The --mirror option controls the way the image is scanned. By reading the image data from right to left the image is mirrored. Valid options are "yes" and "no". The default is "no".
The --speed option can improve the scan speed in monochrome mode. Valid options are "yes" or "no", the "yes" option will speed up the scan if this option is supported.
The --auto-area-segmentation switch activates the automatic area segmentation for monochrome scans. The scanner will try to determine which areas are text and which contain images. The image areas will be halftoned, and the text will be improved. Valid options are "yes" and "no". The default is "yes".
The --gamma-table parameter can be used to download a user defined gamma table. The option takes 256 values from the range 0-255. In color mode this option equally affects the red, green, and blue channel.
The --red-gamma-table parameter can be used to download a user defined gamma table for the red channel. The valid options are the same as for --gamma-table.
The --green-gamma-table parameter can be used to download a user defined gamma table for the green channel. The valid options are the same as for --gamma-table.
The --blue-gamma-table parameter can be used to download a user defined gamma table for the blue channel. The valid options are the same as for --gamma-table.
The color correction coefficients --cct-1 --cct-2 --cct-3 ... --cct-9 will install color correction coefficients for the user defined color correction. Values are specified as integers in the range -127..127.
The --preview option requests a preview scan. The frontend software automatically selects a low resolution. Valid options are "yes" and "no". The default is "no".
The --preview-speed options will increase the scan speed if this is supported by the scanner. Valid options are "yes" and "no", the default is "no".
The geometry options -l -t -x -y control the scan area: -l sets the top left x coordinate, -t the top left y coordinate, -x selects the width and -y the height of the scan area. All parameters are specified in millimeters.
The --quick-format option lets the user select a scan area with predefined sizes. Valid parameters are "CD", "A5 portrait", "A5 landscape", "Letter", "A4" and "max". The default is "max", which selects the largest possible area.
The --source option selects the scan source. Valid options depend on the installed options. The default is "Flatbed".
The --auto-eject option will eject a page after scanning from the document feeder.
The --film-type option will select the film type for scans with the transparency unit. This option is only activated if the TPU is selected as scan source. Valid options are "Negative Film" and "Positive Film".
The --focus-position option selects the focus position for all scans. Valid options are "Focus 2.5mm above glass" and "Focus on glass". The focus on the 2.5mm point above the glass is necessary for scans with the transparency unit, so that the scanner can focus on the film if one of the film holders is used. This option is only functional for selected scanners, all other scanners will ignore this option.
The configuration file /etc/sane.d/epson.conf specifies the device(s) that the backend will use. Possible connection types are:
- This is the default, and if nothing else is specified the backend software will open a given path as SCSI device. More information about valid syntax for SCSI devices can be found in sane-scsi?(5).
Usually SCSI scanners are configured with a line "scsi EPSON" in this file. In some cases it may be necessary to only use the string "scsi" (e.g. for the GT-6500).:
- PIO - Parallel Interface
- The parallel interface can be configured in two ways: An integer value starting at the beginning of a line will be interpreted as the IO address of the parallel port. To make it clearer that a configured IO address is a parallel port the port address can be preceded by the string "PIO". The PIO connection does not use a special device file in the /dev directory. The IO address can be specified in hex mode (prefixed with "0x").:
- A device file that is preceded by the string "USB" is treated as a scanner connected via the Universal Serial Bus. The correct special device file has to be created prior to using it with Sane. See the USB documentation for more information about how to set up the USB subsystem and the required device files.:
- The static library implementing this backend.:
- The shared library implementing this backend (present on systems that support dynamic loading).:
- If the library was compiled with debug support enabled, this environment variable controls the debug level for this backend. E.g., a value of 128 requests all debug output to be printed. Smaller levels reduce verbosity.:
- If the library was compiled with debug support enabled, this environment variable controls the SCSI related debug level for this backend. Only a value of 2 is supported.:
- This allows one to override the function or command level that the backend uses to communicate with the scanner. The function level a scanner supports is determined during the initialization of the device. If the backend does not recognize the function level reported by the scanner it will default to function level B3. Valid function levels are A1, A2, B1, B2, B3, B4, B5, B6, B7, B8, D1 and F5. Use this feature only if you know what you are doing!:
None :-) At least none are currently known.
The backend may be used with Epson scanners that are not yet listed under the list of supported devices. A scanner that is not recognized may default to the function level B3, which means that not all functions that the scanner may be capable of are accessible.
If the scanner is not even recognized as an Epson scanner this is probably because the device name reported by the scanner is not in the correct format. Please send this information to the backend maintainer (email address is in the AUTHOR section of this man page or in the AUTHORS file of the SANE distribution).
The Perfection 600, Perfection 650, Perfection 660, Perfection 1250 and Perfection 1260 are not supported by this backend.
The package is actively maintained by Karl Heinz Kremer ([email protected]). The software is based on work by Christian Bucher and Kazuhiro Sasayama