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Photoshop in Focus

Sometimes just part of an image needs to be output as grayscale. When working with a CMYK image, that sometimes means making sure the selected areas of the image output only on the black separation. If they appear on all printing plates, you get rich black, a black supplemented with the CMY inks. To keep something in the black channel only, try this:

1.
In the Layers palette, make sure the proper layer is active. If the image cannot be flattened, perform the following steps on the appropriate layers individually.

2.
Make a selection of the area that needs to be grayscale. It's usually a good idea to feather the selection slightly when possible.

3.
Switch to the Channels palette and make the Cyan channel active. Cut.

4.
Click on the Black channel to make it active and then paste.

5.
Cut from the Magenta channel and paste to the Black channel.

6.
Cut from the Yellow channel and paste to the Black channel.

7.
If necessary, keep the Black channel active and use Levels or Curves to adjust the selection.


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