Created attachment 6832 [details] patch.txt Interpolation isn't used when in landscape mode. We'd like it to be. Attached is a patch that gets us most of the way there. Something is still wrong when we're rendering in bands though... parking it here to avoid accidentally losing it.
Closing as a duplicate of 690246, which has a more modern patch on. *** This bug has been marked as a duplicate of bug 690246 ***