Definitions for "Colour Bars"
A strip of tones used to check colour quality, you will find it on the proofs, printing plates or printed job
a series of coloured squares printed on the edge of a sheet for quality control by the press operator.
Carried on all four-colour process proofs to show the amount of ink used, the trapping, and the relative densities across the press sheet. A guide for the platemaker and the printer.
A television picture consisting of several coloured vertical bars, which is used for testing the performance of colour television equipment and transmission paths. There are several variants of the colour bar signal in use worldwide.