Hallo, ich habe hier einen Tip gefunden, vielleicht ist das auch für andere interessant:
View your image in two color modes simultaneously in
Photoshop (6.x/7.x)
When creating a document that will eventually be converted
from RGB to CMYK, it can sometimes be difficult to picture
how the colors will look upon conversion. To eliminate any
guesswork, why not work on your RGB document while
previewing it in CMYK?
To do so, open an RGB image in Photoshop. Then, choose
Window > Documents > New Window. Doing so opens a second
view of your document. Next, choose View > Proof Setup >
Working CMYK. Now go back to your original document and
work away while previewing everything in CMYK.
Grüße, Renate