User guide

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ImageScreen
This node layers images together using the Screen compositing algorithm: F+B-FB. It's similar to ImageHypot, but
clamps pixel values to 1.0. This is mostly useful for combining mattes.
NOTE: ImageScreen math assumes image values are between 0 and 1. If your highlights go above 1.0,
ImageScreen may produce unexpected results.
Also see ImageHypot on page192.
Control (UI) Default Value Function
R enabled When enabled, affect the red channel of the image.
G enabled When enabled, affect the green channel of the image.
B enabled When enabled, affect the blue channel of the image.
A enabled When enabled, affect the alpha channel of the image.
mix 1 Dissolves between the bg image at 0 and the full merge effect at
1.
Mask
channel A The channel from the out_mask input to use as a mask:
• R - use the red channel as the mask.
• G - use the green channel as the mask.
• B - use the blue channel as the mask.
• A - use the alpha channel as the mask.
By default, the merge is limited to the non-black areas of the
mask.
invert disabled Inverts the use of the mask channel so that the merge is limited
to the non-white areas of the mask.
fringe disabled When enabled, the mask is modified so that by default the
merge is limited to the fringe (semi-transparent areas).
4 NODES I-K | IMAGESCREEN