User Manual

Selecting one of the other menu options switches the display to a grayscale image showing
which pixels are part of the selected range. White pixels represent pixels that are considered to
be part of the range, and black pixels are not in the range. For example, choosing Shadows
would show pixels considered to be shadows as white and pixels that are not shadows as
black. Mid gray pixels are only partly in the range and do not receive the full effect of any color
adjustments to that range.
Channel
The Channel menu in this tab can be used to examine the range of a specific color channel. By
default, Fusion displays the luminance channel when the color ranges are examined.
Spline Display
The ranges are selected by manipulating the spline handles. There are four spline points, each
with one Bézier handle. The two handles at the top represent the start of the shadow and
highlight ranges, whereas the two at the bottom represent the end of the range. The Bézier
handles are used to control the falloff.
The midtones range has no specific controls since its range is understood to be the space
between the shadow and the highlight ranges.
The X and Y text controls below the spline display can be used to enter precise positions for
the selected Bézier point or handle.
Output the Range You See Now as Final Render
Selecting this checkbox causes the monochrome display of the range shown in the viewers to
be output as the final render. Normally, the Color node outputs the full RGBA image, even if the
node were left to display one of the color ranges in the view instead. This control makes it
possible to use the Color Corrector node to generate a range’s matte for use as an effect mask
in other nodes.
Preset Simple/Smooth Ranges
These two buttons can be used to return the spline ranges to either Smooth (default) or Simple
(linear) settings.
Options Tab
The Options tab includes a few very important processing operations including a simple
solution when color correcting premultiplied Alpha channels.
Pre-Divide/Post-Multiply
Selecting this option divides the color channels by the value of the Alpha before applying the
color correction. After the color correction, the color values are re-multiplied by the Alpha to
produce a properly additive image. This is crucial when performing an additive merge or when
working with CG images generated with premultiplied Alpha channels.
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