Datavideo DVK-400, Instruction Manual

Page: 24 / 60

24
Open Angle
The “Open Angle” allows you to set the chromakey color range. In most cases, ±77 will be
appropriate. For example, when yellow/green objects become translucent, decrease the
chromakey color range until they become opaque. You can use the slider or left and right arrow
keys to adjust the “Open Angle”.
Black Level
Increase the black level to eliminate uneven distribution in the background of the composite
output. Switch PVW OUT to Matte (see
Section 4.1 Output Source ) for a clearer view of the
process. You can use the slider or left and right arrow keys to adjust the “Black Level”.
White Level
Adjust the white level to obtain a uniform distribution of white on objects which should remain
fully non-transparent. Uneven distribution may arise from the fact that the foreground subject
may have color components close to the screen color. In this case an adjustment can be made
using the function known as White Level.
Switch PVW OUT to Matte for a clearer view of the process. You can use the slider or left and right
arrow keys to adjust the “White Level”.