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Chapter 23 Color Correction 647
Parameters
This node displays the following controls in the Parameters tab:
inSpace
Selects the incoming color space.
outSpace
Selects the output color space. For example, if you use one ColorSpace, you probably
use rgb as your inSpace, and then something like hsv to convert it to hue/saturation/
value space. After applying your operations, you usually apply a second ColorSpace
node, with hsv as your inSpace and rgb as your outSpace.
luminanceBias
The weighing of the three channels for the luminance calculation in conversions
involving HSL. Luminance differs from value in that luminance calculates brightness
based on the human eye’s perception that green is brighter than an equal value in the
blue channel.
• rWeight
• gWeight
• bWeight
ColorX
The ColorX node modifies each pixel in the image according to an expression that you
supply. ColorX is normally slower than a dedicated, optimized node such as Mult or Add.
Use dedicated operators whenever possible. You can also set up complex rules inside
the node (see below).
For more information on using expressions, see Chapter 31, “Expr
essions and Scripting,”
on page 935.