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WHAT IS A SELECTION?

You can work with an image in two ways—either globally or locally. The global approach affects the entire image or active layer, and it's something I'm sure you've done while experimenting with Photoshop filters. Working locally begins by selecting part of the image and then applying a filter. See figure 2.1 for examples of both. Without a selection, Photoshop will always work globally and change all the pixels of the active layer. To control where Photoshop applies a change, use a selection or a mask to “tell” Photoshop exactly where the change should take place. The changes you make can be as subtle as lightening up part of a landscape or changing a section of a color image into black and white, or it can be as radical as the limits of your own imagination, such as superimposing a decrepit skull onto a person's face to imply mortality.

Figure 2.1. From left to right: Original, Filter applied globally, and Filter applied locally.

© John Macintosh



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