What is four color process printing?

Also called ” process printing,” process printing refers to the printing of a full spectrum of colors using only 4 ink colors layered over each other: Cyan, Magenta, Yellow, and Black (or, CMYK). These CMYK colors can be used in combination, with varying degrees of DPI(dots per inch) coverage, to create many different colors. Mosaic uses this method to print photographic images on light colored shirts or images that have more colors than a simulated process print(see previous article) can accomplish. This process works best on light colored shirts, like white or natural, due to the fact that the transparent CMYK inks tend to pick up the color of the shirt underneath.  Some shirt colors will require a white ink plate to help bring out the colors better.