[sane-devel] terrible (systematically corrupted) jpg at 1200dpi

[m. allan noah]

at least in lineart mode, the scanner maximum is 300dpi. Try scanimage
--mode=color --help

allan

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
> 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 `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 [75]
>         Sets the resolution of the scanned image.
>     --source Flatbed|ADF|Duplex [Flatbed]
>         Selects the scan source (such as a document-feeder).
>   Advanced:
>     --brightness 0..2000 [1000]
>         Controls the brightness of the acquired image.
>     --contrast 0..2000 [1000]
>         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.
>   Geometry:
>     -l 0..215.9mm [0]
>         Top-left x position of scan area.
>     -t 0..355.6mm [0]
>         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:
>     hpaio:/net/HP_Officejet_Pro_8620?ip=10.10.0.29
> ====================================================================
>
>
>
>
> 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
>>
>> allan
>>
>> 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.
>>>>
>>>> allan
>>
>>
>>
>>
>



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