Sometimes it may feel like editing layer masks in Photoshop does not work. For example, the eraser tool may not erase. If that is the case, there are a few possible reasons and remedies.
- In a mask, erase and delete changes colour to the background colour. To make it erase from the mask, make sure black is the background colour. A quick way to do this, is to highlight the mask and simply press "D", which sets the foreground and background colours to their default values - white and black. (The default values for an image area are the opposite - black and white.)
- Make sure the mask is highlighted. (If it is not, edits will obviously go somewhere else.)
- If you have a selection, make sure it selects the thing you want to edit, and not the reverse. (shift-command-I).
Some keyboard shortcuts for working with masks:
- To move a mask from one layer to another, just drag it.
- To copy a mask from one layer to another, alt-drag it to the other layer.
- To copy a mask from one image to another, drag the layer icon it is attached to to the other image. You cannot drag the mask alone.
- To temporarily hide the effects of a mask, shift-click on it.
- To make a selection from a mask, command-click on it.
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