2.5 All files to be in CMYK color format | v.20210625
Large scale commercial printing uses an offset printing process, most commonly consisting of the use of CMYK plates (Cyan, Magenta,Yellow, and Black). All files must be submitted in CMYK color format. Do not use RGB colorspace for your files. RGB is a format for onscreen images. For more information on the CMYK printing process see 1.3.