printing problems

using:
gqview 2.0.1
cups 1.1.23
gutenprint 5.0.0-rc2
epson stylus C85

Other applications,
like firefox, gimp, abiword,
print fine.

When printing with gqview,
I get a black/white picture of low quality.

Messages in cups error_log:
Subtractive gray mapping not implemented
Gutenprint detected broken job options,
Output quality is degraded.
Are you using psnup or non-ADSC PostScript?

Thanks.

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