QTR-Quadtone RIP

Quick followup on my own issue:

Trying various dithering algorithms with 1440 super or 1440 (both at 
the better setting) had no effect.

Printing at 2880 got rid of microbanding but introduced major bronzing

Adding 12.5% monochromatic gaussian noise to the shadows and printing 
at my normal settings solved the problem.

So thanks to Tom Moore and indeed it looks as if there is an issue in 
the gimp printing side of things.

David Meddings