Select
Enable Mask to enable an existing mask for display.
Choose a default behavior for any images outside the image mask:
Do Not Affect prevents modifications to images that are outside the mask boundary.
Hide Image(s) hides the images that are outside the mask boundary.
Unload Image(s) unloads from memory any images that are outside the mask boundary.
Note: If you select
Do Not Affect, any images that were previously unloaded by the mask must be manually reloaded if you want to view them. Any images that were previously hidden by the mask must be manually shown. To show a hidden image, select the image frame, then right-click and click
Show Image.
If you select
Hide Image(s) or
Unload Image(s), you can select
Show Image Frame(s) to show the frames of hidden or unloaded images.