[gs-bugs] [Bug 690278] Can't create CMYK separate 1 Bit/Sample TIFF files

bugs.ghostscript.com-bugzilla-daemon at ghostscript.com bugs.ghostscript.com-bugzilla-daemon at ghostscript.com
Mon Feb 9 09:01:01 PST 2009


http://bugs.ghostscript.com/show_bug.cgi?id=690278

ray.johnston at artifex.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement
           Keywords|                            |bountiable



------- Additional Comments From ray.johnston at artifex.com  2009-02-09 09:01 -------
This is probably not very difficult, but I recommend that, for consistency with
the 'bit***' devices and the ppmraw devices, the -dGrayValues= value be used.

While some devices described in 'doc/Devices.htm' use BitsPerSample and
BitsPerPixel, it would be better to stick to -dGrayValues= since this is
described in doc/Use.htm, which is a more general document, and is more likely
to be "discovered" by users.

For a bounty solution, I'd like to see the documentation in doc/Devices.htm
for the tiffsep device as well as improved documentation in the doc/Use.htm
section.

Note that in the meantime, programs such as ImageMagick 'convert' can be used
in a separate step to dither the gray images down to 1-bit per pixel.
For example,

convert bits-8.tif -ordered-dither o8x8 -depth 1 bits-1.tif



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