2. Image -> Mode -> CMYK & 8Bit/Kanal
3. Edit -> Convert to profile -> Destination space: Coated Fogra39
4. Image -> Resolution: 300 Pixel/Inch & Scale to the desired size
5. Image -> Adjustments -> Curves & Adjust brightness if necessary
6. Rightclick on Layer -> Flatten Image
7. Save as... -> Save as .tif file.
8. Tif Options -> Image compression: LZW
Byteorder: Interleaved
Pixelorder -> Mac: Macintosh
Windows: IBM PC