[gs-bugs] [Bug 691922] Slightly wrong colors on RGBW model

bugzilla-daemon at ghostscript.com bugzilla-daemon at ghostscript.com
Sun Feb 13 13:41:49 UTC 2011


http://bugs.ghostscript.com/show_bug.cgi?id=691922

--- Comment #30 from Oldřich Jedlička <oldium.pro at seznam.cz> 2011-02-13 13:41:48 UTC ---
(In reply to comment #23)
> I had to change the raster-convert src to put height rather than -height into
> the bmp header.  I presume the posted src tries that to deal with the
> vertically flipped data, but it broke viewers, et al.  With that change I was
> able to pipe the bmps into bmptopnm to get something I could analyze.

The first page of CUPS raster is stored left-to-right, top-to-bottom. The BMP
has bottom-to-top pixel order for positive heights and top-to-bottom for
negative heights (read from wikipedia
http://en.wikipedia.org/wiki/BMP_file_format). Maybe bmptopnm cannot deal with
negative heights or you tried to process second page (back-side for duplex
print), which might have different pixel order according to CUPS spec.

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