These terms refer to front printing only or front and back printing. The 4 represents the four colors in the CMYK color space. This is the color space used in digital printing. These four colors combine to create full-color prints.
What Do 4|0 and 4|4 Mean?
These terms describe whether a piece is printed on one or both sides of a flat sheet:
4|0 (Four Over Zero):
Only the front side of the file has printing.
The back side is blank.
For folded items, this means nothing is printed on the inside panels.
4|4 (Four Over Four):
Both the front and back sides are printed using CMYK colors.
Files converted from RGB to CMYK will always contain 4 colors on our presses.
For folded items, this includes printing on inside panels.
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