Adobe After Effects Visual Effects and Compositing

Question 1

Which After Effects effect is most commonly used to remove a green or blue screen background?

Accepted Answer

Keylight (1.2)

Answer

Keylight (1.2) is the industry-standard chroma keying plugin included with After Effects.

Question 2

What is a 'Track Matte' in After Effects?

Accepted Answer

A layer that controls the transparency of the layer directly below it

Answer

A Track Matte uses the luminance or alpha of one layer to determine the transparency of the layer beneath it in the stack.

Question 3

What does the 'Collapse Transformations' switch do for a pre-composed layer?

Accepted Answer

Passes the pre-comp's transformations and frame size through to the parent composition

Answer

Collapse Transformations lets the parent comp 'see through' the pre-comp so transformations and frame sizes are inherited correctly.

Question 4

Which blending mode makes black pixels transparent and white pixels fully opaque?

Accepted Answer

Screen

Answer

Screen blending mode inverts, multiplies, and inverts again, resulting in black areas becoming transparent.

Question 5

What is a 'Pre-composition' (pre-comp) in After Effects?

Accepted Answer

A nested composition used as a single layer within another composition

Answer

Pre-composing groups selected layers into a new composition that appears as a single layer in the original timeline.

Adobe After Effects Practice Test