User guide
188
Control (UI) Default Value Function
inputs Unpremultiplied Select whether you are using a premultiplied or unpremultiplied
input image:
• Premultiplied - the ImageGamma node unpremultiplies the
input, applies the gamma change, and premultiplies the input
again. This simulates applying the gamma change before the
premultiplication was done, as color corrections are typically
applied on unpremultiplied images.
• Unpremultiplied - the ImageGamma node simply applies the
gamma change.
ImageGeometric
This node layers images together using the Geometric compositing algorithm: 2FB/(F+B). This is another way of
averaging two images. Visually, it's close to ImageMin.
You can also specify a different compositing algorithm using the operation control.
Also see ImageAverage on page140 and ImageHypot on page192.
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
4 NODES I-K | IMAGEGEOMETRIC