Word supports the RGB color mode and not the CMYK color mode used by printing offices. Thus, in many cases, the colors of created PDF files need to be converted, and conversion can cause unexpected surprises.
- Many RGB colors are not part of the CMYK colors. Thus eg. the neon green color that can be perfectly printed by a dirt-cheap inkjet printer at home may be colorless by a ten million digital or a hundred million offset pressing machine.
- We have already seen where the black color channel was missing when it was decomposed into colors in a PDF made from Word. Without black, it is quite difficult to print e.g. the shady parts in an image.
Fortunately, these conversion problems are most common in offset printing. Digital printing machines making fewer copies are more tolerant for the RGB color mode, with much less error.