Channel Mixer

By using the Channel Mixer, current channels can be combined to form a new channel. This has two distinct purposes:

• Scenario 1. A digital photo had a write error and one of the channels is damaged. You can use the two good channels to create a replacement for the third.

• Scenario 2. You want better grayscales. You can choose the monochromatic option and produce much better grayscales than by simply switching modes or desaturating.

Let's try the second scenario out and manually create a new grayscale image.

Step 1. Open the file Ch09_Channel_Mixer.tif from the chapter's folder on the DVD-ROM.

Step 2. Choose Layer>New Adjustment Layer>Channel Mixer... and click OK to create the adjustment layer.

Step 3. Check the Monochrome box and adjust the Red, Green, and Blue sliders to taste. Depending on your source image, you'll want to emphasize different channels. In general, emphasize Red when skin tones are involved.

Step 4. When satisfied with the new grayscale conversion, click OK.

Step 5. To permanently apply the image adjustment, choose Image>Mode>Grayscale.

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