[gs-bugs] [Bug 692353] New: TIFFSEP always antialiases against full "black"

bugzilla-daemon at ghostscript.com bugzilla-daemon at ghostscript.com
Mon Jul 18 13:22:36 UTC 2011


http://bugs.ghostscript.com/show_bug.cgi?id=692353

           Summary: TIFFSEP always antialiases against full "black"
           Product: Ghostscript
           Version: master
          Platform: Macintosh
        OS/Version: MacOS X
            Status: UNCONFIRMED
          Severity: normal
          Priority: P4
         Component: PDF Interpreter
        AssignedTo: alex.cherepanov at artifex.com
        ReportedBy: roxton at gmail.com
         QAContact: gs-bugs at ghostscript.com


Created an attachment (id=7684)
 --> (http://bugs.ghostscript.com/attachment.cgi?id=7684)
Simple 2-spot PDF

If I'm interpreting these results correctly, TIFFSEP always seems to antialias
against solid "black", even if the adjacent spot isn't solid.

In this example, Spot #1 is a field of 50%.  Spot #2 is a flower on top of it.

When rasterized (result.s0.tif), the field of black is at 50%, except the
pixels coincident with the flower, where some of the pixels are actually darker
than 50%.

This bug may be associated with Bug 687674 and possibly Bug 692303.

gs -sDEVICE=tiffsep -dBATCH -dSAFER -dNOPAUSE -dGraphicsAlphaBits=4
-dTextAlphaBits=4 -r72 -sOutputFile="result.tif" AntiAliasTest.pdf 

This was tested against the master (configured with --with-libiconv=no).

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