User Manual

Direction
Forward applies all values normally. Reverse effectively inverts all values.
Clip Black/White
The Clip Black and Clip White checkboxes clip out-of-range color values that can appear in an
image when processing in floating-point color depth. Out-of-range colors are below black (0.0)
or above white (1.0). These checkboxes have no effect on images processed at 8-bit or 16-bit
per channel, as such images cannot have out-of-range values.
Pre-Divide/Post-Multiply
Selecting the Pre-Divide/Post-Multiply checkbox causes the image pixel values to be divided
by the Alpha values before the color correction, and then re-multiplied by the Alpha value after
the correction.
This helps to prevent the creation of illegally additive images when color correcting images with
premultiplied Alpha channels.
Common Controls
Settings Tab
The Settings tab in the Inspector appears in other Color nodes. These common controls are
described in detail at the end of this chapter in “The Common Controls” section.
Channel Booleans [BOL]
The ChannelBooleans node
Channel Booleans Node Introduction
The Channel Booleans node applies a variety of mathematical and logical operations on the
channels in an image. This node works by using one image’s channels to modify another
image’s channels. If a foreground input is not available, selecting options that use color
channels from the foreground ends up using the background input’s color channels instead.
NOTE: Be aware of another similarly named Channel Boolean (3Bol), which is a 3D
node used to remap and modify channels of 3D materials. When modifying 2D
channels, use the Channel Booleans (with an “s”) node (Bol).
Inputs
There are four inputs on the Channel Booleans node in the Node Editor, but only the orange
Background input is required.
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Background: This orange input connects a 2D image that gets adjusted by the
foreground input image.
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