Created attachment 6073 [details] Bug690770.pdf Starting with r7647 the attached PDF file has dropouts when rendered with -dDOINTERPOLATE (the image is too dark when rendered with older revisions but the problem is the same as with head). The command line I'm using: bin/gs -dDOINTERPOLATE -sDEVICE=ppmraw -o test.ppm ./Bug690770.pdf
Sounds like an color or image interpolation filter issue. Assigning to Micahel (sorry Michael).
One of the images is a type 3 image, which consists of a cmyk image and a bit mask image. The clip mask image is not being interpolated but is using the image_simple_expand renderer while the CMYK image is using image_render_interpolate_icc (with interpolation). Note, you can avoid and transparency headaches by doing -dNOTRANSPARENCY and you will still see the issue.
Just to be clear here... the complaint is about the jaggies on the edge of the shadow under the car?
Created attachment 10205 [details] car4.pdf Simplified file.
Fixed in: commit 5347e2c3e43a28f64b0e4775945c6a58ee72debf Author: Robin Watts <robin.watts@artifex.com> Date: Tue Sep 17 13:50:56 2013 +0100 Bug 691182: Disable interpolation for Type3 postscript images If we interpolate an image, but not its mask we get nasty edge effects. We therefore choose not to interpolate either.