Precautions and steps when using digital proofing
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1. Adjust the linearity of the printer
When performing digital proofing, you first need to adjust the linearity of the printer. When the printer uses different paper and ink, its linearity is different; when the state of the printer changes, the linearity changes.
The accuracy of linearity can be quickly checked by printing gray scales. The most critical problem in linear control is to ensure that no partial color cast occurs, that is, to prevent different tone from being biased into different colors. The middle or bright tone is biased to another color, so that future adjustments are very difficult to do.
2. Comparison of printed ICC and printer ICC
The color gamut of the printer ICC is preferably larger than the color gamut of the printed ICC. If the color gamut of the printer is smaller than the printing color gamut, the proofing effect may be shallow. When there are images in the original and dark color blocks of the same color, the printing is not good with the color. When the image is with the image, the density of the dark toner is not enough, and the gray is gray; when the dark color is used, the image is too Deep, maybe even paste. Such a printer ICC can be adjusted little, and the color matching effect is definitely not good and needs to be redone.
There are many reasons for the small color area of the printed ICC, mainly because of the reason of printing paper and ink, the paper is too thin, the ink absorption performance is not good, the ink is impure, the quality of the expired is decreased, etc., which will lead to the reduction of the printing color gamut.
To see if there is a jump in the printed ICC and the proofing ICC, if there is a jump, the color of such a layout cannot be simulated normally. The reason for the printing ICC color hopping is mainly due to the increase of printing dots; the reason for the printer ICC jump is mainly because the linearity of the printer is not done well, and it is necessary to correct the linearity of the printer, correct or redo the ICC.
Color gamut comparison of printed ICC and printer ICC in ProfileMaker 5. It can be seen that in the dark adjustment area (L value is 23), the print color gamut cannot contain the printing color gamut, and the colors outside those color gamut cannot be simulated by the normal proofing. There are two possibilities for this. One is that the color target is not printed properly, and the color cast is large; the other is that the print gamut is too small and the printer ICC file needs to be redone.
In addition, in the figure, it can be seen that the edge of the printing color gamut is not smooth, and there is a jump. If the digital proofing is adjusted according to the printing source, many colors may not be simulated.
3. Use third-party software to adjust ICC files
Many times we need to adjust ICC through third-party software. There are many softwares for editing ICC, but the basic idea of school color is consistent. The following takes ProfileMaker5 as an example to illustrate the basic steps of color correction.
(1) Correct the background color. According to the company's production situation, it is decided whether the background color needs to be retained, and the color of the background color can be adjusted according to the actual situation.
(2) Correct the gray balance using the gray balance tool. The adjustment effect can be checked by neutral gray scale proofing (note: the change in gray balance will affect all colors, and the adjustment should not be too large).
(3) Correct the color cast of the CMYK basic color using a linear tool, especially the correction of the monochrome K. Pay attention to the change of gray balance during the adjustment process.
(4) Correct the secondary colors C+M, C+Y, Y+M, C+K, Y+K, M+K using the linear adjustment tool. Especially the dark and midtone parts of these colors.
(5) Selective color correction for CMYK again. Selective color correction is for printer ink. Generally speaking, the more single color, the better the selection effect. For synthetic neutral gray, the effect of using selective color correction is not obvious, and it is adjusted by gray balance tool. The effect is better. For neutral gray, you can increase the proportion of black and stabilize the color.
(6) Finally adjust the brightness, saturation, and contrast of the proof image to perform overall color correction.
(7) After doing this, measure the CMYK solid color block with a densitometer to ensure that its density is close to printing.