Transforming a layer mask in Photoshop allows you to resize, rotate, or reposition the masked area without affecting the underlying image. This is achieved primarily using the Free Transform tool.
Steps to Transform a Layer Mask:
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Select the Layer Mask: In the Layers panel, ensure the layer mask thumbnail (the white or black square next to the layer thumbnail) is selected. This is crucial; selecting the layer itself will transform the image, not the mask.
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Activate Free Transform: Press Ctrl+T (Cmd+T on Mac) to activate the Free Transform tool. A bounding box will appear around your layer mask.
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Transform the Mask: Use the handles on the bounding box to resize, rotate, skew, or distort the mask. You can also move the entire mask by clicking and dragging inside the bounding box. Remember, you're modifying the area affected by the mask, not the underlying image.
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Confirm Transformation: Press Enter (Return on Mac) or click the checkmark in the options bar to apply the transformation.
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Deselect (Optional): Press Ctrl+D (Cmd+D on Mac) to deselect the mask if needed.
Alternative Methods and Considerations:
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Linking and Unlinking: The layer and its mask are linked by default. Click the chain icon between the layer and mask thumbnails to unlink them. This allows you to move the layer and mask independently.
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Selection from Mask: To select the areas defined by the mask, Ctrl+click (Cmd+click on Mac) the layer mask thumbnail. This creates a selection based on the mask's opaque areas (white).
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Using the "Select and Mask" Feature: For more advanced adjustments, especially refining selections, use the "Select and Mask" workspace (accessible via the "Select" menu or by double-clicking the mask thumbnail). This provides tools for refining edges and other adjustments.
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Show Transform Controls: If you are not seeing the bounding box, make sure that the "Show Transform Controls" option is enabled. This can vary depending on your Photoshop version.
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Transforming Multiple Masks Simultaneously: While there isn't a direct method to simultaneously transform multiple layer masks that are on separate layers, you can potentially use actions or scripting for this more advanced use case.
By following these steps, you can effectively transform your layer masks to achieve the desired effects in your Photoshop projects.
