Graphics Reference
In-Depth Information
affects another Mask) feels reversed from the top-down compositing paradigm
After Effects operates. But, in actuality, the order Masks are calculated is similar
to the rendering calculations of layers - they actually render bottom-up with the
last layer being calculated first, leading upward to the top layer last. The same
goes for Masks - the last Mask in a layer is the first to be calculated, then its
Mix Mode is applied to the Mask/s above, and so forth. The example below
shows you the results different Mask Mix Modes can create:
A
Add
- two or more masks act in concert, making one larger mask with
feathered edges blending smoothly.
B
Subtract
- the layer's path shape is removed from the layer above the
Subtract Mask layer.
C
Intersect
- where the Intersect Mask layer's path shape overlaps the
Mask shape above is the new Mask shape.
D
Lighten
- similar to Add except that Mask Feathering is not smooth but
linear in its transition.
E
Darken
- similar to Lighten but works similar to the Subtract mode.
F
Difference
- where the Difference Mask overlaps the Mask path above
forms an exclusion area.
