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MASKS AND MATTES
MASKS AND MATTESTransparency Transparency (alpha, opacity) defines a pixel color’s
visibility
in a layer
Every element imported into AE contains an opacity channel
If an element does not have one, it adds a channel with solid (opaque – white) values
This channel can be changed for EVERY pixel using the Opacity
attribute with all layers: example: Opacity values 0% – 100%
MASKS AND MATTESMasks Rather than an attribute to control opacity for every pixel, we can select certain regions to reveal
When we “carve out” sections of opacity in a layer, we create what we term a “mask”
Masks can be created in a variety of ways
Ellipse or Rectangle tools
Pen Tool allows us to draw around an object to create a closed curve
Mask attributes added to layer:
Can keyframe mask shape, select mask, Animation->Create Mask keyframe (can also click on stopwatch next to Mask shape)
Move to another frame, reshape, automatically saves keyframe
MASKS AND MATTESMatteMatting
We can also use an image (as opposed to selecting regions ourselves) to control areas of opacity
Such images are called mattes, grayscale images
We can create them using a variety of tools
A matte used with a movie is called a tracking matte
MASKS AND MATTESMatte examplesgrey scale images that will define transparency
MASKS AND MATTESIn labWe will work with both masks and mattes to see how they are
created or utilized in after effects.
We will import this image
images into after effects and
use the pen tool and a grey scale
image to define the regions of
transparency.