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Chapter 10. Creating Layer and Channel M... > Making Channel Masks from Native Col...

Making Channel Masks from Native Color Channels

Creating a channel mask from a native color channel, takes a few steps; however, if you're successful the effort spent making the selection is well worth it. The trick to creating a mask with a native color channel is to use the shifts of gray in one specific color channel to create the black and white areas characteristic of a typical channel mask. For example, you have an image of a model, and you want to remove the model from the background. Unfortunately, that requires selecting around the model's hair, a difficult thing to accomplish, even in the best of circumstances. To make the channel mask, open the Channels palette and examine the native color channels, one at a time. You're looking for a color channel that displays a significant shift of gray between the model's hair, and the background. For example, you click on the red channel of an RGB image, and the models hair appears dark gray, while the background appears light gray. The difference is so pronounced you can actually see individual strands of hair, standing out against the background. If you can find such a contrast, you can quickly make a channel mask.


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