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Photoshop in Focus

One statement in this chapter deserves a bit more attention. The Channel Mixer is touted as an excellent way to create grayscale images from color pictures. To see for yourself, try this:

1.
Open a copy of an RGB image.

2.
If it has multiple layers, flatten it.

3.
Click twice on the leftmost button at the bottom of the History palette. That makes a pair of copies of the image. Zoom out, if necessary, and position the windows so that you can view all three onscreen at the same time.

4.
Use the Image, Mode, Grayscale menu command to convert one image.

5.
Click on another copy of the image. Use the Image, Adjustments, Desaturate menu command followed by Image, Mode, Grayscale.

6.
Switch to the third copy, and use Image, Adjustments, Channel Mixer to open the dialog box.

7.
Select the Monochrome check box.

8.
Set the Red, Green, and Blue fields to 40, and change the Constant slider to -7.

9.
Concentrate on an area of extreme highlight or extreme shadow. Slowly move the sliders back and forth, juggling the amounts of each channel you add or subtract. Watch how you can target certain tonal ranges, depending on the content of each channel.

10.
As you work, compare this image with the others. Look for a balance in your mix that makes the image “pop” and provides the best tonal range.


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