Grass Valley Maestro Master Control v.2.4.0 - Manual (Page 296)

MAESTRO — User Manual 292
Visualization Tool
Note The Alpha Brush button toggles the paint options on or off each time it is
clicked.
2. Click the Invert Color button if the preferred paint mode is not selected.
• The white paintbrush add more transparency areas to the alpha
channel which allows portions of the image to be visible through
the key mask
• The black paintbrush erases portions of the alpha channel transpar-
ency and masks out portions of the image.
3. Select the preferred paintbrush shape (square or circular) and
paintbrush size.
4. Paint (or erase) the preferred areas of the alpha channel transparency as
shown in
Figure 181 .
Note You may perform paint operations in any of the three preview windows - Orig-
inal image, Alpha Channel or Key Image.
Figure 181. Create Transparency with Eraser Tool
Changing the Background Color
The background color can be changed in the Keyed Image window in order
to see how that color may change the appearance of the image with the
alpha channel applied and to better see the simulated key.
Follow these steps to change the background color:
1. Click the Change Color button in the Keyed Image preview window
( Figure 182 on page 293 ).
A color selection dialog appears.
Alpha Channel Transparency with White paint brush
Alpha Channel Transparency with Black paint brush