In practical applications, the printing operator can place the color mark in any suitable place, such as the upper or lower edge of the paper or sheet format, the margin trimming area at the top, and the gutter section printed along the cylinder. Although this option is not suitable in the end, because it can only provide channel information to the ink supply system of the printing press, it is better to measure some data and observe the limits of these data than nothing.
In the most ideal situation or when maximum control is required and the typesetting position permits, the color mark should be placed across the typesetting page, parallel to the ink supply cylinder, and as close as possible to the center of the printed page, because at the beginning and end of the typesetting page There is a greater possibility of changes at the edges. This placement method can measure across the length of the printed matter, and can provide good printing information for the entire paper.

Note: Avoid placing color patches where they may be folded, cut, or punched. These will hinder or destroy the measurement values ​​obtained by printing color scales.

Recommendation: If time and materials allow, it is best to use the same color-coded film to print the job and test version, placed on the top edge, center, bottom edge and along the direction of the roller. Include pictures in the test layout, print them so that the pictures match the pre-proofing proofs of the test layout, and then select some printing features while ensuring the stability of the printing press. Measure the color scales of these four locations separately, and compare their dot gain, density, and other measurement data. Through these operations, you can realize the effect of different color mark positions on the measurement data, including whether a color mark placed along the direction of the cylinder can provide more information on the test copy reproduction status.

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