Apple Motion 5.1.1 - Manual (Page 237)

Chapter 7 Basic compositing 237
The Add blend mode is useful for using one image to selectively texturize another, based on
its lighter areas such as highlights. You can also use Lighten, Screen, Color Dodge, and Linear
Dodge to create variations of this effect.
•
Lighten: Emphasizes the lightest parts of each overlapping image. Every pixel in each image is
compared, and the lightest pixel from either image is preserved, so the final image consists of
a dithered combination of the lightest pixels from each image. Whites in both images show
through in the resulting image. The order of two layers affected by the Lighten blend mode
does not matter.
•
Screen: Like Lighten, Screen emphasizes the lightest parts of each overlapping image, except
that the midrange color values of both images are mixed together more evenly. Blacks in
either image allow the overlapping image to show through completely. Darker midrange
values underneath a specific threshold allow more of the overlapping image to show. Whites
from both images show through in the resulting image. The order of two layers affected by the
Screen blend mode does not matter.
The Screen blend mode is useful for knocking out the blacks behind a foreground subject,
instead of using a Luma Key. It’s mainly useful when you want the rest of the foreground
subject to be mixed with the background image, based on its brightness. It’s good for glow
and lighting effects and for simulating reflections. You can also use the Add, Lighten, and Color
Dodge blend modes to create variations of this effect.
Top object Bottom object Screen composite
67% resize factor