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.
