Free Knowledge – What are Colour Bars?
Colour Bars are placed beyond the bleed area to allow the printer to control the colour on the printed page.
Colour Bars not only provide a constant stable standard for measuring the flow of various colours used in a printed image over the duration of a print run, they measure the visual properties of ink as well as the performance properties of the printing press. They also provide information for comparing a colour proof to the printed version.
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