User Manual

Table Of Contents
Lock Alpha/Spill Removal Color Balance Reference
Unlocking this allows you to use different color references when generating the Alpha and
when determining how much of the background color to subtract from the image. When
enabled, spill and color are combined.
Color Balance Reference
The Color balance reference controls adjust for lighting or white balance that might be reducing
background color purity and saturation. A correction is applied based on the reference of a
neutral-colored object when generating the key and determining the amount of background
color subtraction, without altering the background color that is subtracted.
Pre Matte Tab
The Pre Matte tab is in some ways a garbage matte keyer that occurs before the delta keyer
process. It is used to even out the screen color before a more delicate key is done. After
selecting the initial screen color, you can switch to the Pre Matte tab and view the PreMatte Out
from view mode menu at the top of the Inspector. The Pre Matte works on ranges of color, so
you start by dragging a bounding box around areas where lighting is different from the initial
screen color pick. Use the Soft range to expand, and Erode to cut away the edges.
Once you have a more even screen selection, you can move to the Matte tab.
Soft Range
The Soft Range extends the range of selected color and rolloff of the screen color.
Erode
Erode contracts the edge of the pre matte, so the edge detail does not clip.
Blur
This softens the edges of the pre matte.
Pre Matte Range
These controls update automatically to represent the current color selection. The controls
tweak the selection slightly, although selecting colors in the viewer is all that is required.
Chapter – 98 Matte Nodes 2153