[sane-devel] terrible (systematically corrupted) jpg at 1200dpi
m. allan noah
kitno455 at gmail.com
Wed Jan 28 12:23:15 UTC 2015
at least in lineart mode, the scanner maximum is 300dpi. Try scanimage
On Tue, Jan 27, 2015 at 9:13 PM, ken <gebser at mousecar.com> wrote:
> No error message at all.
> $ scanimage --help
> Usage: scanimage [OPTION]...
> Start image acquisition on a scanner device and write PNM image data to
> standard output.
> -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
> 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 `hpaio:/net/HP_Officejet_Pro_8620?ip=10.10.0.29':
> Scan mode:
> --mode Lineart|Gray|Color [Lineart]
> Selects the scan mode (e.g., lineart, monochrome, or color).
> --resolution 75|100|200|300dpi 
> Sets the resolution of the scanned image.
> --source Flatbed|ADF|Duplex [Flatbed]
> Selects the scan source (such as a document-feeder).
> --brightness 0..2000 
> Controls the brightness of the acquired image.
> --contrast 0..2000 
> Controls the contrast of the acquired image.
> --compression JPEG [JPEG]
> Selects the scanner compression method for faster scans, possibly at
> the expense of image quality.
> --jpeg-quality 0..100 [inactive]
> Sets the scanner JPEG compression factor. Larger numbers mean better
> compression, and smaller numbers mean better image quality.
> -l 0..215.9mm 
> Top-left x position of scan area.
> -t 0..355.6mm 
> Top-left y position of scan area.
> -x 0..215.9mm [215.9]
> Width of scan-area.
> -y 0..355.6mm [355.6]
> Height of scan-area.
> Type ``scanimage --help -d DEVICE'' to get list of all options for DEVICE.
> List of available devices:
> On 01/27/2015 08:27 PM, m. allan noah wrote:
>> did it give you an error message? What is the output of scanimage --help
>> On Tue, Jan 27, 2015 at 5:40 PM, ken <gebser at mousecar.com> wrote:
>>> Good to know. Thanks.
>>> How do I get a 1200dpi image out of scanimage?
>>> scanimage -v -p --format=PPM --mode=Color --resolution=1200 > si1200.ppm
>>> didn't work.
>>> On 01/27/2015 04:57 PM, m. allan noah wrote:
>>>> Does it happen with the command line tool scanimage? If so, then it is
>>>> a problem with the backend, which is part of hplip.
"well, I stand up next to a mountain- and I chop it down with the edge
of my hand"
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