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Chapter 9. Making Selections and Creatin... > Selections and Masks: Telling Photos...

Selections and Masks: Telling Photoshop Where to Work

Whether it's deleting part of an image, adding color, or perhaps applying a filter, you need to let Photoshop know which pixels you want to change. Using a painting tool (or other tool that works with brushes), you need simply select a brush and drag. The size, shape, and hardness of the brush, combined with the course along which the tool is dragged, control what happens.

When working with adjustments, filters, and many other menu commands, you must first identify the target area. You can, of course, apply a filter or other command to an entire layer. By not isolating a section of the layer, you have, in effect, identified where you want the filter to work: the entire layer. However, often you need to apply a filter to only a section of a layer. That's when you need to use selections and masks.


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