[Inkscape-translator] Two meanings for 'screen'?

Please, all use the search option to look out for the word 'screen' that may be translated wrongly in your language, as it appears to have two different meanings: 1. The computer screen (duh) and 2. Some mask-like overlay function.

I am struggling with the (Dutch) translation of the latter. Could someone explain this function, possibly provide some synonimes?

Thanks in advance Stephan