Canon ip4500 funny colours
I copied some ICC profiles from XP, but it said they were not printer profiles. I also searched Icc files on this system, and found a pretty similar selection in usr/share/color.
But this got me googling for ICC + ip4500, and I found that there are lot's of paper manufacturers offering ICC profiles for their papers. I tried an ordinary matte one, and the result was the same muted murky colors. But I did notice that the print dialogue had gained a 'color' tab. This was set to RGB, but I experimented and found that 'KCMY' color space prints just right.
Still trying to understand why, but thanks for nudging me in the right direction