[sane-devel] Avision AV220 Questions (LED digit, Buttons, Backends, Paper size)

[Crypto]

On Sunday 01 February 2009 22:34:10 Jeffrey Ratcliffe wrote:
> 2009/2/1 Crypto <crypto at online.de>:
> > 2.) In scanning software such as gscan2pdf etc. there is an option to set
> > contrast and brightness. Brightness goes from -100 (I suppose to make
> > scans darker) to +100 (makes scans brighter). I can set this option to
> > positive values and get brighter scans, but when I attempt to get darker
> > scans I get an error message "Unknown message: Argument "" isn't numeric
> > in subtraction (-) at /usr/bin/scanimage.pl line 357". This also happens
> > if I use different backends for scanning such as scanadf.pl. In
> > scanadf.pl it's line 380 but same error otherwise.
>
> This is a bug in gscan2pdf. If you post the output for
>
> scanimage --help
>
> I'll try and reproduce it.
>
> Regards
>
> Jeff

Jeff,

sorry it took me a bit to test.

scanimage --help gives me:

Usage: scanimage [OPTION]...

Start image acquisition on a scanner device and write PNM 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), and %i (index number)
-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 number in filename by an amount of #
    --batch-double         increment page number by two for 2sided originals
                           being scanned in a single sided scanner
    --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 default input buffersize
-V, --version              print version information

Options specific to device `avision:libusb:001:004':
  Scan mode:
    --mode Lineart|Dithered|Gray|Color [Color]
        Selects the scan mode (e.g., lineart, monochrome, or color).
    --resolution 50..600dpi (in steps of 1) [150]
        Sets the resolution of the scanned image.
    --speed 0..4 (in steps of 1) [inactive]
        Determines the speed at which the scan proceeds.
    --preview[=(yes|no)] [no]
        Request a preview-quality scan.
    --source ADF Front|ADF Back|ADF Duplex [ADF Front]
        Selects the scan source (such as a document-feeder).
  Geometry:
    -l 0..216mm [0]
        Top-left x position of scan area.
    -t 0..362mm [0]
        Top-left y position of scan area.
    -x 0..216mm [216]
        Width of scan-area.
    -y 0..362mm [362]
        Height of scan-area.
    --overscan-top 0..4mm [0]
        The top overscan controls the additional area to scan before the paper
        is detected.
    --overscan-bottom 0..4mm [0]
        The bottom overscan controls the additional area to scan after the
        paper end was detected.
    --background-lines 0..50pel [0]
        The background raster controls the additional background lines to scan
        before the paper is feed thru the scanner.
  Enhancement:
    --brightness -100..100% (in steps of 1) [0]
        Controls the brightness of the acquired image.
    --contrast -100..100% (in steps of 1) [0]
        Controls the contrast of the acquired image.
    --quality-scan[=(yes|no)] [yes]
        Turn on quality scanning (slower but better).
    --quality-cal[=(yes|no)] [yes]
        Do a quality white-calibration
    --gamma-table 0..255,... [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..255,...
        Gamma-correction table for the red band.
    --green-gamma-table 0..255,...
        Gamma-correction table for the green band.
    --blue-gamma-table 0..255,...
        Gamma-correction table for the blue band.
    --exposure 0..1000% (in steps of 1) [inactive]
        Manual exposure adjustment.
    --infra-red[=(yes|no)] [inactive]
        Enable infra-red scan mode.
    --multi-sample[=(yes|no)] [inactive]
        Enable multi-sample scan mode.
    --frame 0..0 [inactive]
        Selects the number of the frame to scan
    --power-save-time <int> [15]
        Allows control of the scanner's power save timer, dimming or turning
        off the light.
    --nvram-values <string> [Vendor: AVISION
Model: AVISION AV220
Firmware: 1.00
Serial: TW1062E1M7300137
Manufacturing date: 2006-2-22
First scan date: 2006-7-15
ADF simplex scans: 2966]
        Allows access obtaining the scanner's NVRAM values as pretty printed
        text.

Type ``scanimage --help -d DEVICE'' to get list of all options for DEVICE.

List of available devices:
    avision:libusb:001:004

I have tried to use scanimage.pl using the --brightness option, which gives me 
the error I described:

pucki71 at pucki:~$ scanimage.pl --brightness -100
Argument "" isn't numeric in subtraction (-) at /usr/bin/scanimage.pl line 
357.
Argument "" isn't numeric in subtraction (-) at /usr/bin/scanimage.pl line 
357.
Argument "" isn't numeric in subtraction (-) at /usr/bin/scanimage.pl line 
357.
Argument "" isn't numeric in subtraction (-) at /usr/bin/scanimage.pl line 
357.
scanimage.pl: option --brightness: index 4 out of range [0..4]

scanimage itself reports no error:
pucki71 at pucki:~$ scanimage --brightness -100
scanimage: sane_start: Document feeder out of documents

(which is fine because I indeed there were no documents in feeder).

So I guess not gscan2pdf has a bug but scanimage.pl and scanadf.pl seem to 
have.

scanadf.pl gives me:
pucki71 at pucki:~$ scanadf.pl --brightness -100
Argument "" isn't numeric in subtraction (-) at /usr/bin/scanadf.pl line 380.
Argument "" isn't numeric in subtraction (-) at /usr/bin/scanadf.pl line 380.
Argument "" isn't numeric in subtraction (-) at /usr/bin/scanadf.pl line 380.
Argument "" isn't numeric in subtraction (-) at /usr/bin/scanadf.pl line 380.
scanadf.pl: option --brightness: index 4 out of range [0..4]

which is the error I reported.

Does this give You a clue about what is going wrong?

What is the difference in using scanimage.pl vs. scanimage and using 
scanadf.pl vs. scanadf?

Thanks for Your fast reply.

Kind regards,
Crypto.