masking

The concealment or screening of one sensory process or sensation by another.

A piece of theatrical scenery used to conceal a part of the stage from the audience.

The act or diversion of covering the face with a mask, or of wearing a masquerade dress; masquerading.

In photography, a device adopted in printing from an imperfect negative, consisting in pasting tissue-paper on the reverse side of the negative over the portions of the picture which print too deeply.

Present participle of mask.