User Manual

Color Space
The splines in the LUT view represent color channels from a variety of color spaces. The default
is Red, Green, and Blue. The options in this menu allow an alternate color space to be selected.
A detailed description of the color spaces available here are below:
 RGB (Red, Green, Blue): Fusion uses the RGB color space, and most nodes and
displays interpret the primary channels of an image as Red, Green, and Blue.
 YUV (Luma, Blue Chroma, and Red Chroma): The YUV color space is used in the
analog broadcast of PAL video. Historically, this format was often used to color correct
images, because of its familiarity to a large percentage of video engineers. Each pixel is
described in terms of its Luminance, Blue Chroma, and Red Chroma components.
 HLS (Hue, Luminance, and Saturation): Each pixel in the HLS color space is described
in terms of its Hue, Luminance, and Saturation components.
 YIQ (Luma, In Phase, and Quadrature): The YIQ color space is used in the analog
broadcast of NTSC video. This format is much rarer than YUV and almost never seen in
production. Each pixel is described in terms of its Luminance, Chroma (in-phase or red-
cyan channel) and Quadrature (magenta-green) components.
 CMY (Cyan, Magenta, and Yellow): Although more common in print, the CMY format
is often found in computer graphics from other software packages. Each pixel is
described in terms of its Cyan, Magenta, and Yellow components. CMY is nonlinear.
Color Channels (RGBA)
Use the Color Channel controls to select which channel’s spline is currently active for editing.
The labels of these controls change to reflect the names of the channels for the current color
space. Normally, they are read as Red, Green, and Blue. If the Color Curves node is operating in
YUV color space, they are read as Y, U, and V instead.
These controls do not restrict the effect of the node to a specific channel. They only select
whether the spline for that channel is editable. These controls are most often used to ensure
that adding or moving points on one channel’s spline do not unintentionally affect a different
channel’s spline.
Spline Window
The Spline Window displays a standard curve editor for each RGBA channel. These splines can
be edited individually or as a group, depending on the color channels selected above.
The spline defaults to a linear range, from 0 in/0 out at the bottom left to the 1 in/1 out at the top
right. At the default setting, a color processes to the same value as the output. If a point is
added in the middle at 0.5 in/0.5 out, and the point is moved up, this raises the mid color of the
image brighter.
The spline curves allow precise control over color ranges, so specific adjustments can be made
without affecting other color values.
In and Out
Use the In and Out controls to manipulate the precise values of a selected point. To change a
value, select a point and enter the in/out values desired.
Chapter – 85 Color Nodes 1868