I am getting strange printing problems when printing large solid areas. See attached example - this has the original png I'm trying to print, and the results of printing it scanned back in. On the scan you can see vertical lines of green and a large blob of green too.
I'm printing from Ubuntu 11.04 via IPP on my local network to a Debian Wheezy server. The Debian server is runnng CUPS 1.5, Gutenprint 5.2.7.
This happens to a number of things I've tried to print, the connection seems to be large blocks of colour with high red values.
If I shrink the print, the vertical lines dissappear, but not the blobs. If I add noise to the block of red, the problem is much reduced.