Here's another example - photo taken as carefully as I could (with
proper white balance) - on the right is the original image, top left a
CMYK version printed and below an RGB version printed.

What is most revealing, I think, is the white to black gradient on the
bottom left of each image.  Although the CMYK model doesn't have as high
contrast, it is at least a pretty accurate ramp, whereas with the RGB
model something clearly goes very wrong a quarter of the way into the
black end.

This really needs to be addressed - it looks like it probably effects an
awful lot of people!


** Attachment added: "CMYK vs RGB printing using CUPS/PIXMA"
   
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1181884/+attachment/3980048/+files/printingtest.jpg

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https://bugs.launchpad.net/bugs/1181884

Title:
  Canon MG6200 printer driver has incorrect default color model

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