User Manual

No matter how good the composite may look, once you’ve selected the screen color to pull a
key, you need to load the DeltaKeyer node into the viewer itself. This allows you to evaluate the
quality or density of the alpha channel created by the key. Above the viewer, click the Color
button in the viewer toolbar, or click in the viewer and press C to switch the viewer between the
RGB color channels of the image and the alpha channel.
Loading the DeltaKeyer into the viewer and clicking the
Color button to view the alpha channel being produced.
Black in a matte represents the transparent areas, while white represents the opaque areas.
Gray areas represent semi-transparency. Unless you are dealing with glass, smoke, or fog, most
mattes should be pure white and pure black with no gray gray areas. If a close examination of
the alpha channel reveals some fringing in the white foreground of the mask, the DeltaKeyer
has integrated controls for post-processing of the key and refining the matte. Following is a
quick checklist of the primary adjustments to make.
After making the screen selection with the Eyedropper, try the following adjustments to
improve the key.
 Adjust the Gain slider to boost the screen color, making it more transparent. This can
adversely affect the foreground transparency, so adjust with care.
 Adjust the Balance slider to tint the foreground between the two non-screen colors.
For a green screen, this pushes the foreground more toward red or blue, shifting the
transparency in the foreground.
Clicking the third of the seven tabs of controls in the DeltaKeyer Inspector opens up a variety of
controls for manipulating the matte.
Initial adjustments in the matte tab may include the following parameters:
 Adjust the lower and upper thresholds to increase the density in black and white areas.
 Very subtly adjust the Clean Foreground and Clean Background sliders to fill small
holes in the black and white matte. The more you increase these parameters, the more
harsh the edges of your matte become.
Chapter – 70 Compositing Layers in Fusion 1427