Apple Shake 4 - Manual (Page 636)

636 Chapter 23 Color Correction
Consolidated Correctors
The consolidated correctors (ColorCorrect, ColorMatch, ColorReplace, HueCurves) are your
primary tools for tasks such as matching skin tones, shadow levels, spill suppression, and
so on. Functions performed by the atomic-level nodes are also performed by these, but
are combined with many other tools which provide more control over the result.
The following table includes general guidelines to help you understand why there are
so many nodes in the Color Tool tab. For example, you can perform an add operation
either with an Add node, or with a ColorCorrect node. In either case, the result is the
same, but for simple operations the Add node may be more straightforward to use,
with the additional benefit that it concatenates with many other color-correction
operators.
The following is a basic list of the color-correction nodes and how they are useful:
Node Description
Add Raises or lowers all colors evenly. This is the only legal color
correction in log space.
AdjustHSV Shifts the entire Hue, Saturation, or Value range.
Brightness Multiplies the R, G, and B channels by a single value.
Clamp Good for clamping off values that go above or below a desired
level.
ColorCorrect A multi-functional color-correction node that lets you make many
different adjustments to an image. It includes a premultiplied input
flag.
ColorMatch Matches the lows, midtones, and highlights in one image to those
in another.
ColorReplace Replaces one color in an image with another. It also makes a better
chroma keyer than the ChromaKey node.
ColorSpace Converts an image into a different color space, such as RGB, HSV,
CMY, and so on.
ColorX Lets you apply pixel-based mathematical expressions to an image.
Compress Squeezes the range of color in an image up and down, and is
particularly useful for creating fog effects with a DepthKey mask.
ContrastLum Adjusts contrast. Use Lum to preserve your color levels.
ContrastRGB Adjusts the contrast of individual channels, including the alpha
channel.
Expand Another levels adjuster that raises or lowers your low and high
points.
Fade Adjusts the opacity of an image. This node works the same as using
Mult with identical values in all four channels.
Gamma Gamma adjustments affect midtone color values while leaving the
white and black points of the image unaltered.