[bug-gs] problem with antialiasing (gs 8.x)

[Arnaud Desitter]

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Symptoms:
When displaying overlapping polygons with antialiasing enabled
(-dGraphicsAlphaBits=4), spurious lines appears.
See example attached.
Is there any workaround or fixes available ?

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Ghostscript version (or include output from "gs -h"):
AFPL Ghostscript 8.13 (2003-12-31)
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Command line:
gs -q -dBATCH -dNOPAUSE -dSAFER  -sDEVICE=png16m \
    -sOutputFile=bb.png bb.ps

(no spurious horizontal lines)
vs

gs -q -dBATCH -dNOPAUSE -dSAFER  -sDEVICE=png16m \
    -dGraphicsAlphaBits=4  \
    -sOutputFile=bb.png bb.ps
(produces spurious horizontal lines)
 

Thanks,
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