FA 4

T/F: By default, all masks are set to Add, and additional masks interact with masks above them in the Timeline.

True

Live-action shooting for compositing is commonly referred to as:

Chroma key / green screen / blue screen

T/F: You can create masks using Auto-trace to convert color or alpha values into a path.

True

Which is a valid method for creating a mask?

Convert a shape path to a mask path by copying the shape's path to Mask Path

T/F: Spending a lot of time making a perfect garbage matte can negate the time-saving advantage of keying.

True

T/F: Roto Brush and Refine Edge are among the tools listed to create transparency for compositing.

True

In the Keylight workflow, after picking Screen Color, which section helps isolate foreground/background in matte view?

Screen Matte (adjust Clip Black/Clip White)

T/F: The Roto Brush & Refine Edge effect is applied automatically when the first stroke is drawn in the layer pane

True

Rotoscoping in AE is primarily

Drawing/animating masks to define a matte across frames

T/F: Rotoscoping in AE typically involves motion tracking first to help masks follow objects.

True

T/F: Difference keying compares frames to a baseline background and can be sensitive to noise and grain

True

Chroma keying makes pixels transparent based on:

A selected color value (and similar values)

To key out a luminance value with Luma Key, you adjust:

Threshold and Tolerance (plus Edge Thin/Feather)

When using a garbage matte, what is the first step?

Create a mask to roughly outline the subject

Which feature is listed as a way to make portions of a layer transparent when compositing?

Roto Brush and Refine Edge

T/F: Parallaxing simulates depth by moving layers at different rates appropriate to distance.

True

In After Effects compositing, what does "compositing" mean?

Combining visual elements from separate sources into single images

A garbage matte is primarily used to:

Roughly remove unneeded portions of the scene to keep only the subject

T/F: Masks can be open or closed paths; only closed paths can create transparent areas.

True

Luminance keying uses:

Brightness (luminance) thresholds to turn pixels transparent

T/F: Magenta screens have been used for keying work in feature films known for visual effects.

True

The Refine Edge tool is used to:

Improve an existing matte with partial transparency in fine details (hair/fur)

T/F: Luminance keying operates on brightness rather than color and is often used with grayscale graphics.

True

T/F: You must always use a green screen; other solid colors are not suitable for chroma keying.

False

T/F: A hold-out matte should be positioned directly below the keyed layer.

False

T/F: Reveal masking is primarily used for text reveals, while crop masking hides parts of a frame to show what's beneath.

True

Which statement correctly distinguishes masks from Shape Layers?

Masks exist in the layer they are affecting (Shape Layers have their own layer)

T/F: Masks reside on their own separate layers, not inside the layers they affect.

False

Keying is the process of:

Defining transparency based on a color or luminance value

Difference keying requires:

A clean baseline background frame to compare against

T/F: Keying is useful for replacing complex backgrounds that would be difficult to mask.

True

Which screen color is generally avoided for human subjects due to skin tones?

Red

T/F: Refine Edge is primarily for creating the initial matte, while Roto Brush is for improving hair/fur transparency.

False

T/F: Compositing is often used for 2D content, layering multiple images for print, web, and apps.

True

Which statement about mask paths is accurate?

Closed-path masks can create transparent areas; open paths cannot but can drive effects

T/F: Proper green screen setup (clean, big, wrinkle-free, with subject at a good distance) improves keying results.

True

Which After Effects effect is commonly used to perform chroma keying?

Keylight

T/F: Roto Brush strokes help create and propagate a segmentation boundary over time.

True

The Refine Edge tool is used to:

Improve an existing matte with partial transparency in fine details (hair/fur)

By default, what is the mask mode for newly created masks, and can mask modes be animated over time?

Default is Add; mask modes cannot be changed over time

A hold-out (hold-back) matte is best described as:

:V???