Adjusting overlapping spot colors
To prevent overlapping spot colors from either printing over or knocking out the underlying spot color, remove one of the spot colors where they overlap.
Use a printed sample of the overprinted inks to adjust your screen display to help you predict how colors will look when printed.
Note: In some cases, such as when you use varnish and bump plates, you may want colors to overprint.
To adjust overlapping spot colors:
- In the Channels palette, select the spot channel with the color you want to print.
- Choose Select > Load Selection.
- For Channel, choose the spot channel from step 1, and click OK.
- To create a trap when knocking out the underlying color, choose Select > Modify > Expand or Contract, depending on whether the overlapping spot color is darker or lighter than the spot color beneath it. For more information on trapping, see Creating color traps.
- In the Channels palette, select the underlying spot channel that contains areas you want to knock out. Press Backspace (Windows) or Delete (Mac OS).
- If a spot color in one channel overlaps more than one other spot color, repeat this process for each channel that contains areas you want removed.
To quickly select an image in a channel, hold down Ctrl (Windows) or Command (Mac OS), and click the channel in the Channels palette.
This method can be used to knock out areas from any channels under a spot color, such as the CMYK channels.