[sane-devel] grey 4bit/pixel
wolframheider at web.de
Sat Aug 19 14:46:40 UTC 2006
On Sat, 19 Aug 2006 14:56:58 +0200, abel deuring <adeuring at gmx.net> wrote:
> Shashi Kumar M.S. wrote:
>> iam searching a scanner that supports at about 300 dpi and 4 bit /pixel
>> scanner. i found from the scanner that most of the scanner support 8/16
>> depth in grey mode.
>> is there any way to modify this code to support 4 bit grey scale depth
>> per pixel.
> well, the source code of scanimage, xsane etc is freely available ;)
>> all suggestions are welcome
> - look for a (documented) file format that supports 4 bit images (or
> define your own format ;)
> - patch scanimage or another frontend so that it can write the scan
> data in the format you selected. Alternatively, you can convert
> existing 8 bit images, as produced by a Sane frontend, with a
> converter program. I am not aware of any 4 bit image formats, but
> if they exist, you might already find such a converter in the
> usual Linux distributions. Otherwise, write one. The PPM, PGM, PBM
> formats (default for scanimage output) are very simple, and it is
> quite straightforward to read them with C, Python, Perl, Java or
> whichever other programming language.
'XnView' should do the job.
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