User Manual

 Image: Replaces the spill color with colors from a defocused version of the background
image or the Replace image, if one is connected to the Replace input (magenta ) on
the node. This mode results in a good color tone on the foreground subject even
with a high-contrast background. On the negative side, the Image mode occasionally
loses the fine edge detail of the foreground subjects. Another problem can occur if
you later change the size of the foreground image against the background. Since the
background/foreground alignment would change, the applied color tone from the
defocused image might not match the new alignment.
 Color: Replaces the spill color with a solid color. When this option is selected, a color
swatch and R,G,B sliders are displayed for selecting the color. Changing the palette
color for the solid replacement, you can select a good spill replacement that matches
the composite background. Its strength is that it works fine with even severe spill
conditions. On the negative side, when using the Solid Color Replacement mode, fine
detail on the foreground edge tends to be lost. The single palette color sometimes
cannot make a good color tone if the background image has some high-contrast color
areas.
Degrain Tab
The Degrain tab is used when a foreground image is highly compromised by film grain. As a
result of the grain, when backing screen noise is completely removed, the edges of the
foreground object often become harsh and jagged, leading to a poor key.
Grain Size
The Grain Size selector provides a range of grain removal from Small to Large. If the foreground
image has a large amount of film grain-induced pixel noise, you may lose a good edge to the
foreground object when trying to clean all the grain noise with the Clean Background Noise
Operation Mode. These tools clean up the grain noise without affecting the quality of the key.
 None: No degraining is performed.
 Small: The average color of a small region of the area around the sampled pixel. This
should be used when the grain is very dense.
 Medium: The average color of a medium-sized region of the area around the sampled
pixel. This should be used when the grain is less dense.
 Large: The average color of a larger region of the area around the sampled pixel. This
should be used when the grain is very loose.
Grain Tolerance
Adjusting this slider increases the effect of the Clean Background Noise tool without changing
the edge of the foreground object.
Chapter – 98 Matte Nodes 2179