PNG colorspace conversion

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how can convert png images have colorspace of /devicegray not /devicergb? have tried in both fireworks , photoshop neither appear give true /devicegray setcolorspace instead give /devicergb setcolorspace

 

this read our xerox color printer color document , costs 10 times amount business.

in case using cups printing system, see

http://sourceforge.net/projects/cupsaddons/files/filter-colorfilter/

for filter converts e.g. /devicergb /devicegray if

r, g, , b components equal.

 

as filter written in perl, quite easy modify function

as standalone utility.

 

helge



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