The logo in the top left of this document is being rendered with a grey background, where it should be white: http://bugs.ghostscript.com/attachment.cgi?id=2610&action=view Tested with r7899.
This is a simplified sample file that paints the whole page instead of drawing some stripes on the top of the page. %! [112.436974 0.0 0.0 27.3221836 55.3542 736.085938] concat << /PatternType 1 /TilingType 1 /XStep 251 /YStep 62 /PaintProc {pop 1 0 0 setrgbcolor 0 0 1000 1000 rectfill } bind /BBox [0 0 251 62] /PaintType 1 >> matrix makepattern setpattern << /ImageType 1 /Width 251 /Height 62 /ImageMatrix [251.0 0.0 0.0 -62.0 0.0 62.0] /BitsPerComponent 1 /Decode [0.0 1.0 ] /DataSource <00FF> >> imagemask showpage
This has been recently fixed in the development version by the rev. 8659.