Hi, esp. Hans,

while finalizing the PDF for our latest book, I recognized a color problem:
The general black color is rendered not 100% black in CMYK mode, but in all channels (converted RGB, I guess).



this is ok, but the color mode is knockout instead of overprint (as it would be usual for CMYK black). That means, black text on a photo is white in the other plates.

If I define


it’s ok in some places, but it messes up many unrelated places, e.g. most images then also use this transparency mode.

has no effect, as far as could find (while we have a warning in the wiki, that you should use this only for grayscale works).

What can I do?

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