NAME

       sane-stv680 - SANE backend for STV680 camera's

DESCRIPTION

       The  sane-stv680 library implements a SANE (Scanner Access Now Easy) backend that provides
       access to some STV680 cameras. This backend should be  considered  beta-quality  software!
       STV680  cameras  are  sold  under various brands like Aiptek.  This backend may or may not
       support yours.

       The cameras that should work with this backend are:

       Vendor Model              USB vendor id  USB product id  status
       ------------------------  -------------  --------------  --------
       AIPTEK stv680                0x0553         0x0202       basic
       Konica e-mini                0x04c8         0x0722       untested
       DigitalDream l'espion XS     0x1183         0x0001       untested
       Creative WebCam Go mini      0x041e         0x4007       untested

       For all these cameras, see the backend home page (under AUTHOR) for the  exact  status  of
       each camera.

       For  startup  of this backend check that if present the stv680 kernel module is removed or
       disabled.
       Also before using, enable the backend by editing  the  /etc/sane.d/dll.conf  file,  change
       #stv680 to stv680.

       For problems with the untested cameras, you should contact the author for that.

       The  options  the  backend supports can either be selected through command line options to
       programs like scanimage(1) or through GUI elements in xcam(1).  For both programs use  the
       -B option needed for size buffer.

       Some frontends examples:

       xcam(1)
              xcam -B

       scanimage(1): for writing in batch mode to a file or to a new file each time:

              scanimage -B -d stv680:libusb:001:002 --batch=out.ppm --batch-count 5 --mode "Color
              RGB"
              scanimage -B -d  stv680:libusb:001:002  --batch=out%d.ppm  --batch-count  5  --mode
              "Color RGB"

       If  you  have  any  success  with  a camera not listed here, or if you observe any strange
       behavior, please report to the backend maintainer or to the SANE mailing list.

       Valid command line options and their syntax can be listed by using:

              scanimage --help -d stv680

       Scan Mode

       --mode selects the basic mode of operation of the webcams valid choices.

              The read resolution mode is 8 bits, output resolution  is  24  bits.   Selects  the
              resolution for a scan.  The camera can do only the resolutions listed.

       --Raw  In this mode raw data is displayed

       --Color
              In this mode the bayer unshuffle is done but no color correction

       --Color_RGB
              Bayer unshuffle, color correction

       --Color_RGB_TXT
              Bayer unshuffle, color correction, textline with date and time is added

       Enhancement options

       --white-level-r -32..+32
              Selects  what  red  radiance level should be considered "white", when scanning some
              sheets by changing the calibration value loaded into the scanner. Scale -32 .. 0 ..
              +32 in steps of 1.

       --white-level-g -32..+32
              Selects  what green radiance level should be considered "white", when scanning some
              sheets by changing the calibration i value loaded into the scanner. Scale -32 ..  0
              .. +32 in steps of 1.

       --white-level-b -32..+32
              Selects  what  blue radiance level should be considered "white", when scanning some
              sheets by changing the calibration value loaded into the scanner. Scale -32 .. 0 ..
              +32 in steps of 1.

CONFIGURATION FILE

       The  configuration file /etc/sane.d/stv680.conf supports only one item: the device name to
       use (eg usb 0x.... 0x....).

FILES

       /usr/lib/x86_64-linux-gnu/sane/libsane-stv680.a
              The static library implementing this backend.

       /usr/lib/x86_64-linux-gnu/sane/libsane-stv680.so
              The shared library implementing this  backend  (present  on  systems  that  support
              dynamic loading).

ENVIRONMENT

       SANE_DEBUG_STV680
              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.

LIMITATIONS

       The  windows  TWAIN  driver has many more options than this SANE backend. However they are
       only software adjustments. This backend only implements what the webcam can support.

BUGS

       Plenty. Parts of this backend are still under development.
              1. Some untested cameras.
              2. Video streaming slow and stops sometimes (scanimage).
              3. Sometimes 1/3 of image is NOK (xcam).

SEE ALSO

       sane(7), sane-usb(5), scanimage(1), xcam(1)

AUTHORS

       Gerard Klaver http://gkall.hobby.nl/stv680-aiptek.html

CREDITS

       Thanks to developers of the other stv680 programs:
              STV680 kernel module
              pencam2 program
              libghoto2(3) program (camlib stv0680)

                                           11 Jul 2008                             sane-stv680(5)