[gs-bugs] [Bug 689779] Colors: 32-bit is incorrect BUT 64-bit works fine

bugs.ghostscript.com-bugzilla-daemon at ghostscript.com bugs.ghostscript.com-bugzilla-daemon at ghostscript.com
Thu Apr 3 19:10:17 PDT 2008


http://bugs.ghostscript.com/show_bug.cgi?id=689779





------- Additional Comments From henry.stiles at artifex.com  2008-04-03 19:10 -------
Hmm, I do see sparse minor pixel differences we might want to look at but
nothing that would result in an obvious visual discrepancy.  Here is what I did
on 64 and 32 bit machines:

# create cmyk 4 bits per pixel 

../debugobj/gs -dBATCH -dSAFER -dQUIET -dNOPAUSE -sPAPERSIZE=letter -g10200x6600
-r1200x600 -sDEVICE=bitcmyk -dCOLORSCREEN -dMaxBitmap=500000000
-sOutputFile=foo.bit ~/testpage-cups.ps -c quit

# convert to something that can be read by imagemagick (ppm)
../debugobj/gs -dBATCH -dSAFER -dQUIET -dNOPAUSE -g10200x6600 -r1200x600
-dMaxBitmap=500000000 -sDEVICE=ppmraw -sOutputFile=32.ppm -- viewcmyk.ps foo.bit
10200

# use -sOutputFile=64.ppm on 64 bit machine.

# do a pixmap diff between 32 and 64 bit output:
compare 32.ppm 64.ppm diff.ppm

# display results
display 32.ppm 64.ppm diff.ppm

This does not account for the the usecie and crd business.  Can you still
produce a problem with my simplified test on your platforms.




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