Creating, Viewing, and Applying Masks_

Grayscale masks can be created in the Layers palette and added to a layer or group. The exception to the rule is a Background layer, which does not include transparency. By default, masks are added automatically to new adjustment layers. However, you can turn off the option in the Layers palette menu, but there is very little or no advantage in doing so.

Masks can be created from existing image data or from an existing path. For example, you can create a selection and then load the content in the selection to define a grayscale mask; likewise, create a path and then use it to define a vector mask.

Masks can be applied to a layer so that the underlying content in the layer is permanently altered, or they can be deleted without affecting the layer content. Existing masks can also be applied to another layer or multiple layers.

These are just a few things you can do with masks; the following sections look at each one in more detail.

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