[sane-devel] grey 4bit/pixel

[Wolfram Heider]

On Sat, 19 Aug 2006 14:56:58 +0200, abel deuring <adeuring at gmx.net> wrote:

> Shashi Kumar M.S. wrote:
>> hi,
>>
>> 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.
>
> Abel
>


'XnView' should do the job.

Wolfram Heider