This unpretentious icon hides a very powerful function that was supplied previously in a separately available Mask module, and sensibly has now been incorporated into the Frame editing module: Dynamic masking.
Take care: This function is larger inside than out
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The function itself is very easy to use. It is less easy to get a general view of all the things it can do. Therefore the possibilities offered by dynamic masking are explained below at greater length than for other frame types.
For Group mask there is one Special function available in the second function group, the inversion of the mask.
