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Controlling how masks in the same layer interact


    Transfer modes for masks control how different masks within a layer interact with one another. By default, all masks are set to Add, which combines the transparency values of any masks that overlap on the same layer. You can apply one mode to each mask, but you cannot change a mask's mode over time.

    The first mask you create interacts with the layer's alpha channel. If that channel doesn't define the entire image as opaque, then the mask interacts with the layer frame. Each additional mask you create interacts with masks located above it in the Timeline window outline. The results of mask modes vary depending on the modes set for the masks higher up in the outline. You can use mask modes only between masks in the same layer. For more information on working with mask modes, see Using mask modes.