Most of Photoshop’s top features are expressed as tools or commands. But some are more conceptual, meaning that they have almost no interface associated with them. Seriously, it goes from your mind to your hands to the mouse to the keyboard to Photoshop.
Selection calculations are a fantastic example. Want to make a new selection? Just drag. Add to an existing selection? Press the Shift key and drag. And that, my friends, is only the beginning.
Photoshop’s selection calculations rely on a handful of keyboard tricks that you can apply to the marquee, lasso, wand, and quick-select tools; not to mention elements of the Layers, Channels, and Paths palettes. In the event that these keyboard tricks seem a bit overwhelming, take heart that the keys work in a kind of rhythm. In all cases, you press Shift to add to a selection, Alt (or Option) to subtract, and Shift+Alt (Shift+Option) to find the intersection. Watch the video to learn more.
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