Gray image processing method in CMYK image

In the CMYK mode image, a grayscale image is added in the usual way. Since Photoshop has to perform color separation, regardless of the original format of the grayscale image, it will be uniformly converted to the CMYK four-color mode. This gives follow-up Printing brings some sort of slight trouble: because four colors of ink are mixed to create a gray scale, any deviation in the printing process will cause color shifts in the prints, which is more prominent in monochrome machines; Any misalignment of the "rules" will cause the image to be "striped." So try to avoid using "four-color ink" in Photoshop. If it is a single grayscale image, it is normal to directly use the “grayscale” mode to create and save files, but on the same version, there are both color pictures (CMYK four colors) and grayscale pictures (such as a magazine cover for color pictures. The above contradiction occurs when the back cover is grayscale. The following method can be used to make the added grayscale image only exist in the black (K) version, and the above problem can be solved. (Using Photoshop 5.02 Chinese version as an example)

1. Handle the color and grayscale used separately in their respective modes. For the gray position in the color map, the size of the relationship can be based on the color map, the gray map into the observation is appropriate, and then the gray map where the "layer" is deleted, if not appropriate, then the gray The picture is modified, dragged into the color picture, and then deleted. This is repeated until it meets the requirements.

2. In the grayscale image, execute Ctrl+A Select All and Ctrl+C to copy the grayscale image to the pasted version.

3. In the color map, activate the "Channel" palette; click "Underground" to make the "Black" channel the current channel; click the "Eye" in front of the "CMYK" channel, all channels are visible at this time, but the editing action Perform only in the "black" channel; execute Ctrl+V to paste the grayscale in the pasteboard into the "black" channel; the grayscale image that is pasted now is a "selection area" that can be moved to its desired position Request; cancel the selection.

4. Save in TIF format and complete.