Applying a mask to a group of layers in Photoshop is straightforward and offers significant workflow advantages. You essentially apply a single mask that affects all layers within that group.
Applying a Layer Mask to a Group
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Create a Group: First, group the layers you want to mask together in the Layers panel. Simply select the layers and click the "Create a new group from layers" icon (a folder icon) at the bottom of the Layers panel.
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Add a Layer Mask: With the group selected in the Layers panel, click the "Add layer mask" icon (a rectangle with a circle inside) at the bottom of the Layers panel. This adds a mask to the entire group. Any changes you make to this mask (painting with black to hide, white to reveal) will affect all layers within the group simultaneously.
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Edit the Mask: Use a brush tool or other selection tools to paint on the mask. Black hides the layers underneath, and white reveals them. Gray creates a semi-transparent effect. You can also use gradients and other tools for more advanced masking techniques.
Example: Imagine you have several layers forming a complex object—layers for the body, arms, and legs of a figure. Grouping them and adding a single layer mask lets you easily hide or reveal parts of the entire figure at once, rather than masking each layer individually.
Applying a Clipping Mask to a Group (Different Behavior)
While not directly a "mask" in the same sense as a layer mask, a clipping mask can work with a group. A clipping mask limits the visibility of layers above to the shape of the layer below.
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Group Layers (Optional): You can group the layers you intend to be clipped. This isn't strictly required, but it keeps things organized.
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Apply Clipping Mask: Select the layers above that you wish to clip. Then, right-click and choose "Create Clipping Mask" from the context menu.
Key Differences: Layer masks modify the opacity of the layers; clipping masks control the visible area of the layers above.
This method allows for efficient and non-destructive editing. Changes to individual layers within the group will still be preserved, and adjustments to the mask can be easily undone or modified.
