writing CMYK from QImage

[hilbY]

Good Morning,

i search a way to write CMYK - Pictures (z.B. tiff).

I've tested TiffIO, it read wonderfull CMYK, but write this format not....

I've read, that it is possible to simulate CMYK over the RGBA - Values of a QImage, when set a flag (from RGBA to CMYK) after writing the File....but e can't found a concrete example about this :o(

have everybody an idee to solve this problem ?

I have yet asked Trolltech, but they don't know any way..

i need the CMYK-format for printing .

thanks for any help !
hilby