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Channels contain an image's color and selection information Masks isolate and protect parts of an image Quick Mask temporary - used to make selections Alpha Channels are permanent masks (saved selections) Key concept of masking black hides, white reveals Quick Mask Mode paint to apply/remove mask Painting with black add the mask Painting with white removes the mask Painting with gray Partially masks Save Selection saves as an Alpha Channel, can be used over and over again (go to Select > Save Selection) Load Selection Go to Select > Load selection to reload the selected area Layer Masks Attached to a specific layer -- controls what part of the layer is hidden or revealed Layer Masks Thumbnail Located next to the layer thumbnail on the layer it is attached to Layer Mask Selected Click the layer mask thumbnail -- places a black outline to show it is selected and active Clipping Group You can mask artwork on one layer using an image from another layer. In a clipping group, the bottom layer(base layer), masks or controls the shape of any successive layers.