[sane-devel] Canon CanoScan LiDE 100

stef stef.dev at free.fr
Wed Oct 27 19:58:11 UTC 2010

Le Wednesday 27 October 2010 19:17:10 Mauro Torrez, vous avez écrit :
> Hi people,
> in my wokplace they have acquired a new Canon CanoScan LiDE 100 scanner,
> it works perfectly using the Genesys backend, but there are a few
> glitches I'd like to ask you about:
> First, the default color gamma, brightness, contrast is too dark. This
> is not a problem if using XSane, as it lets you adjust them, but when
> using e.g. Simple Scan, which doesn't let you adjust those values by
> hand, the result is not good. Skanlite also has trouble correcting
> color.
> So my first question is: is there a way to set the default
> gamma/brightness/contrast so that they're corrected when scanning from
> any program? (setting them on the backend, or something like that)
> I know it's Simple Scan's fault, but users prefer it to using XSane,
> especially for generating multi-page PDFs.
> Second, the scanner buttons. The output of scanimage --help is the
> following:
> Usage: scanimage [OPTION]...
> Start image acquisition on a scanner device and write image data to
> standard output.
> Parameters are separated by a blank from single-character options (e.g.
> -d epson) and by a "=" from multi-character options (e.g.
> --device-name=epson).
> -d, --device-name=DEVICE   use a given scanner device (e.g.
> hp:/dev/scanner)
>     --format=pnm|tiff      file format of output file
> -i, --icc-profile=PROFILE  include this ICC profile into TIFF file
> -L, --list-devices         show available scanner devices
> -f, --formatted-device-list=FORMAT similar to -L, but the FORMAT of the
> output
>                            can be specified: %d (device name), %v
> (vendor),
>                            %m (model), %t (type), %i (index number), and
>                            %n (newline)
> -b, --batch[=FORMAT]       working in batch mode, FORMAT is `out%d.pnm'
> or
>                            `out%d.tif' by default depending on --format
>     --batch-start=#        page number to start naming files with
>     --batch-count=#        how many pages to scan in batch mode
>     --batch-increment=#    increase page number in filename by #
>     --batch-double         increment page number by two, same as
>                            --batch-increment=2
>     --batch-prompt         ask for pressing a key before scanning a page
>     --accept-md5-only      only accept authorization requests using md5
> -p, --progress             print progress messages
> -n, --dont-scan            only set options, don't actually scan
> -T, --test                 test backend thoroughly
> -h, --help                 display this help message and exit
> -v, --verbose              give even more status messages
> -B, --buffer-size=#        change input buffer size (in kB, default 32)
> -V, --version              print version information
> Options specific to device `genesys:libusb:001:002':
>   Scan Mode:
>     --mode Color|Gray|Lineart [Gray]
>         Selects the scan mode (e.g., lineart, monochrome, or color).
>     --source Flatbed|Transparency Adapter [inactive]
>         Selects the scan source (such as a document-feeder).
>     --preview[=(yes|no)] [no]
>         Request a preview-quality scan.
>     --depth 8|16 [8]
>         Number of bits per sample, typical values are 1 for "line-art"
> and 8
>         for multibit scans.
>     --resolution 1200|600|400|300|200|150|100|75dpi [300]
>         Sets the resolution of the scanned image.
>   Geometry:
>     -l 0..216.07mm [0]
>         Top-left x position of scan area.
>     -t 0..299mm [0]
>         Top-left y position of scan area.
>     -x 0..216.07mm [216.07]
>         Width of scan-area.
>     -y 0..299mm [299]
>         Height of scan-area.
>   Enhancement:
>     --custom-gamma[=(yes|no)] [no]
>         Determines whether a builtin or a custom gamma-table should be
> used.
>     --gamma-table 0..65535,... [inactive]
>         Gamma-correction table.  In color mode this option equally
> affects the
>         red, green, and blue channels simultaneously (i.e., it is an
> intensity
>         gamma table).
>     --red-gamma-table 0..65535,... [inactive]
>         Gamma-correction table for the red band.
>     --green-gamma-table 0..65535,... [inactive]
>         Gamma-correction table for the green band.
>     --blue-gamma-table 0..65535,... [inactive]
>         Gamma-correction table for the blue band.
>   Extras:
>     --lamp-off-time 0..60 [15]
>         The lamp will be turned off after the given time (in minutes). A
> value
>         of 0 means, that the lamp won't be turned off.
>     --threshold 0..100% (in steps of 1) [50]
>         Select minimum-brightness to get a white point
>     --threshold-curve 0..127 (in steps of 1) [50]
>         Dynamic threshold curve, from light to dark, normally 50-65
>     --disable-interpolation[=(yes|no)] [no]
>         When using high resolutions where the horizontal resolution is
> smaller
>         than the vertical resolution this disables horizontal
> interpolation.
>     --color-filter Red|Green|Blue [Green]
>         When using gray or lineart this option selects the used color.
>   Sensors:
>     --scan[=(yes|no)] [no] [hardware]
>         Scan button
>     --file[=(yes|no)] [no] [hardware]
>         File button
>     --email[=(yes|no)] [no] [hardware]
>         Email button
>     --copy[=(yes|no)] [no] [hardware]
>         Copy button
>   Buttons:
>     --clear-calibration []
>         Clear calibration cache
> Type ``scanimage --help -d DEVICE'' to get list of all options for
> List of available devices:
>     genesys:libusb:001:002
> As you can see, near the end there's a section "Sensors" which
> enumerates the four physical buttons available on the scanner.
> Executing `scanimage --scan` throws an error.
> I wonder how these options are to be used, if I could write a script to
> detect when the buttons are pressed, if I should use scanbuttond (which
> I haven't managed to get working) or if I should simply give up as the
> buttons won't work.
> Thank you very much.
> Regards,
> Mauro Torrez.
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	regarding the darkness problem you have, I'm rather inclined to look why 
calibration work as good as it works with my LiDE 100. There is a persistent 
cache for calibration. You may clear it with the --clear-calibration option, 
which is available in the advanced panel option in Xsane. Does clearing it and 
scanning again changes something ?

	Regarding buttons, these options are read-only and thus cannot be set as 
a command line option. If you want to check the button status, you should 
avoid using scripts, it would initialize the scanner each time, which may be 
so long you'll miss button events. You'd rather use scanbuttond.


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