Adobe After Effects Visual Effects and Compositing 2 — Questions and Answers
Question 1: What is the purpose of the 'Set Matte' effect in After Effects?
- Uses the channel of another layer as a transparency matte for the target layer (Correct answer)
- Sets the background color behind a masked layer
- Converts a solid layer to a matte layer
- Applies a gradient transparency to a layer
Correct answer: Uses the channel of another layer as a transparency matte for the target layer
Set Matte lets you specify any layer in the comp as a matte source, giving more flexibility than Track Mattes.
Question 2: What does 'Alpha Inverted Matte' do in the Track Matte options?
- Uses the inverse of the matte layer's alpha channel to define transparency (Correct answer)
- Inverts the color values of the matte layer
- Flips the matte layer vertically
- Removes the alpha channel from the matte layer
Correct answer: Uses the inverse of the matte layer's alpha channel to define transparency
Alpha Inverted Matte makes the layer visible where the matte layer is transparent and invisible where the matte is opaque.
Question 3: Which render order principle means effects are applied BEFORE transformations in After Effects?
- Effects process before the layer's Transform properties are applied (Correct answer)
- Transformations process before effects are applied
- Both process simultaneously
- The order depends on the GPU render mode
Correct answer: Effects process before the layer's Transform properties are applied
In After Effects, effects are applied to the layer source first, and then the layer's transform properties (position, scale, rotation) are applied.
Question 4: What does the 'CC Composite' effect do when combined with other effects in After Effects?
- Composites the original (pre-effect) layer with the post-effect result using a blend mode (Correct answer)
- Creates a copy of the current layer automatically
- Composites two separate layers together
- Renders the composition as a flattened frame
Correct answer: Composites the original (pre-effect) layer with the post-effect result using a blend mode
CC Composite blends the original source of the layer with its effected version using any blending mode.
Question 5: In After Effects, what is 'motion blur' simulating?
- The blur caused by fast-moving objects during a camera's shutter open time (Correct answer)
- The blur applied to static background layers
- A focus blur effect on out-of-focus elements
- The blur from camera lens distortion
Correct answer: The blur caused by fast-moving objects during a camera's shutter open time
Motion blur replicates the smearing captured on film or sensor when an object moves faster than the camera's shutter speed.
Question 6: What is the 'Shutter Angle' setting in After Effects composition settings used for?
- Controls the amount of motion blur by simulating a film camera's shutter open angle (Correct answer)
- Sets the viewing angle of the 3D camera
- Determines the angle of light from the composition's ambient light
- Controls the rotation speed of shape layers
Correct answer: Controls the amount of motion blur by simulating a film camera's shutter open angle
A larger Shutter Angle (up to 360°) produces more motion blur, while a smaller angle produces less.
Adobe After Effects Visual Effects and Compositing 2
What is the purpose of the 'Set Matte' effect in After Effects?