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Chapter 14. Manipulating Images with Fil... > Using a Channel Mask to Control Filt...

Using a Channel Mask to Control Filter Effects

Photoshop's filters can be applied to any raster image. In addition, filters can be controlled with the use of selections. You can use any of Photoshop's selection tools to define a working area. However, sometimes selections are somewhat limited in what they can do. Although selections can be feathered, they basically represent a cookie-cutter work area. What if you want to apply a filter in a completely different way? For example, you want to apply a filter that is more aggressive on the right side of the image, and slowly tapers off from left to right? In that case a simple selection won't help, but a Channel mask will do exactly what you need.


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