User`s manual

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Up to 24 Mask Windows can be configured. Each can be given a name (default is
MaskXX), and a Width and Height are required.
Set Mask is used to save the mask window; the mask will automatically be
centered in the preview window. There currently is no way to move the mask
within the preview window, so the area to mask should be centered in the
preview window.
Clean Mask will remove the mask that is currently selected. Mask Color is
applied to all mask windows.