Apple Motion 3 - Manual (Page 923)

Chapter 10 Using Filters 923
Luma Key
Luma Key pulls a key from your object based on a selected brightness level. This can be
effective if you’re keying a subject that was shot against a solid white or black
background, and exposed so that there are no absolute highlights or shadows within
the foreground subject. Despite this, shadows and highlights in the image usually
make this a difficult filter with which to pull a perfect key.
Parameters in the Inspector
Key Mode: Sets the mode used to calculate the luminance value of your object. The
modes can be selected from the following: Key Out Brighter, Key Out Darker, Key Out
Similar, or Key Out Dissimilar.
Luminance: Sets the type of luminance that is keyed. The types can be selected from
the following: NTSC, PAL, Film, Red, Green, and Blue.
Threshold: Sets the threshold of the key. Values range from 0 to 1.
Tolerance: Sets the tolerance of the threshold. Larger values allow a greater difference
between the set key color and other color values that are incorporated into the key.
Values range from 0 to 1.
Mix: Sets what percentage of the original image is blended with the filtered image.
Values range from 0 to 100%.
HUD Controls
The HUD contains the same controls as the Inspector, with the exception of the Mix
control.
Original image Luma Key filter (set to Darker) applied