Excluding Channels when Blending

When you use the Blending Options dialog box to blend layers or groups, by default all the channels that go to make up the image are blended. However, you can restrict the blending to one or more of the channels. To give one example of the option's usage, you could increase the shadow density in a CMYK file without affecting the color balance by taking the following steps:

2. Apply a curve.

3. Double-click the layer thumbnail to open the Blending Options dialog box.

4. Deselect C, M, Y in Advanced Blending.

5. Hold down Alt (Windows), Opt (Mac OS) and drag the This Layer slider to the left to restrict the blend (holding down the key splits the slider).

6. Move the right part of the slider to the left so that pixels blend smoothly without a harsh transitional edge.

Blending Options can be put to good use when you need to create montages, composite objects over a background or even into a background, remove backgrounds, and the like. The more you use it, the more uses you can find for it.

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