importance of color sequence KCMY while printing

Posted: February 18, 2013 in Color

Color Sequence

Some printers try printing with different color sequences without understanding the effect of such changes.

The schematic representation illustrates three different sequences for overprinting the colors cyan and magenta. Example 1 shows the print result on a single-color press. Firstly, cyan was printed on the white paper. Magenta was then printed on the dry cyan. The result is a saturated blue.

The second example was created on a multicolor press. Firstly, magenta was printed onto the dry paper (wet on dry), followed by cyan on the still moist magenta (wet in wet). While the trapping results for magenta on the paper were good, they were less good for cyan (due to the ink splitting that occurred during overprinting). This resulted in a blue with a red cast.

The third example was also printed wet in wet, but with the reverse color sequence (magenta on cyan). This avoids the red cast. ISO 12647-2 lays down the color sequence black, cyan, magenta, yellow for four-color printing. In order to reduce the effects of ink trapping problems in special cases, the original and the plates should be carefully inspected before mounting the latter on the press. It may be useful, for example, when printing solids, to print the lighter form before the heavier one.

This applies especially when overprinting halftone areas and solids. Firstly, the screen should be printed on the white paper and the solid on top of that.

Source: Heidelberg color quality info

[tag color sequence, trapping, changing process color sequence]

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