1 By saving a selection, you can create and reuse time-consuming selections and uniformly select artwork in an image. You can also combine selections or create new selections by adding to or subtracting from existing selections.
2 A grid helps you make precise, rectangular selections and lay out images symmetrically. Selections, selection borders, and tools snap to the grid when they are dragged within
8 screen pixels of it.
3 You can use adjustment layers to try out color changes before applying them permanently to a layer.
4 You can use the Desaturate command to desaturate, or remove the color, from a selection. Or you can use the Hue/Saturation command and adjust only the Saturation component. Photoshop also includes the sponge tool for removing color.
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