Grass Valley Maestro Master Control v.2.4.0 - Manual (Page 295)

291 MAESTRO — User Manual
Section 6 — Visualization Tools
Figure 179. Visualization Tool Buttons
Using the Alpha Brush Tool
In the Alpha Channel window, the Alpha Brush tool may be used to add
more transparent areas in the alpha channel (white paintbrush) or, erase
portions of the existing alpha channel transparency (black paintbrush).
An alpha channel is a key cutout or mask which allows portions of the
image to be seen through the transparent areas and others to be masked
out. In the example below, the white areas are the transparent areas which
allow portions of the image to be seen. The black areas mask out portions
of the image.
Follow these steps to use the Alpha Brush tool:
1. Click the Alpha Brush button ( Figure 179 ).
Paint tool options appear in the Alpha Channel window as illustrated in
Figure 180 .
Figure 180. Paint Tool Options
Alpha Brush Button Change Button