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Saturation
This slider is a clone of the Saturation control located under the color wheel. The slider makes it easier
to make small adjustments to the value with the mouse. The Saturation control is used to adjust the
intensity of the color values. A saturation of 0 produces gray pixels without any color component,
whereas a value of 1.0 produces no change in the chroma component of the input image. Higher
values generate oversaturated values with a high color component.
Saturation values can be set by dragging the slider, entering a value directly into the text control, or by
dragging the mouse to the left and right on the outer ring of the color wheel control.
Channel
This menu is set for the Histogram, Color, and Levels sections of the Color Corrector node. When the
red channel is selected, the controls in each mode affect the red channel only, and so on.
The controls are independent, so switching to blue does not remove or eliminate any changes made
to red, green, or Master. The animation and adjustments made to each channel are separate. This
menu simply determines what controls to display.
Contrast
Contrast is the range of difference between the light to dark areas. Increasing the value of this slider
increases the contrast, pushing color from the midrange toward black and white. Reducing the contrast
causes the colors in the image to move toward midrange, reducing the difference between the darkest
and brightest pixels in the image.
Gain
The Gain slider is a multiplier of the pixel value. A gain of 1.2 makes a pixel that is R0.5 G0.5 B0.4 into
R0.6 G0.6, B0.48 (i.e., 0.4 * 1.2 = 0.48), while leaving black pixels totally unaffected. Gain affects higher
values more than it affects lower values, so the effect is strongest in the midrange and top range of
the image.
Lift
While Gain scales the color values around black, Lift scales the color values around white. The pixel
values are multiplied by the value of this control. A Lift of 0.5 makes a pixel that is R0.0 G0.0 B0.0 into
R0.5 G0.5, B0.5, while leaving white pixels totally unaffected. Lift affects lower values more than it
affects higher values, so the effect is strongest in the midrange and low range of the image.
Gamma
Values higher than 1.0 raise the Gamma (mid gray), whereas lower values decrease it. The effect of this
node is not linear, and existing black or white points are not affected at all. Pure gray colors are
affected the most.
Brightness
The value of the Brightness slider is added to the value of each pixel in your image. This control’s
effect on an image is linear, so the effect is applied identically to all pixels despite value.
Reset All Color Changes
Selecting this button returns all color controls in this section to their default values.
Chapter 94Color Nodes 1812
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