[sane-devel] grey 4bit/pixel
adeuring at gmx.net
Sat Aug 19 12:56:58 UTC 2006
Shashi Kumar M.S. wrote:
> iam searching a scanner that supports at about 300 dpi and 4 bit /pixel grey
> scanner. i found from the scanner that most of the scanner support 8/16 bit
> 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.
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