Michael Schulz wrote:
The printer is a HPDesignJet 10 ps. The behavior of the printer shows visually a slight red color cast which become obviously in skin tones. The results measuring the FOGRA-strip_v2 are within the norm (2007).
The red cast might be a metamerism issue. If I remember correctly, the HPDesignJet 10 ps inks are very susceptible to metamerism failures. Therefore it's important to view the prints under standard lighting conditions (D50 viewing booth or the like).
Klaus