Analog Way OPS300 User Manual

Page 46

For Chroma Key:

Chroma Keying is used to key from a particular color. It produces a soft-edged key which is most suitable for

moving images and “weatherman” style applications.

Color grabber:

Select Chroma Key menu -> Select Color grabber menu

Using a crosshair, you can select a particular hue based on what is on screen. Once you have adjusted the

crosshairs to a desired position, press set/enter to capture the color value at that instant. You can then adjust

the other parameters such as Tolerance to further refine your key.

Manual Setting:

Select Chroma Key menu -> Manual Settings menu

R,G,B

These controls allow you to manually select a hue, defined by its Red, Green, and Blue values as you

can find in Windows (Paint software).

Tolerance:

The Tolerance parameter allows you to expand your key color selection to include colors which are

similar to the selected value. A tolerance of 1 will select only the desired hue, whereas a tolerance of

255 will select nearly all hues.

Black Level:

This option permits adjustment of the luminance levels of the keyed hue. The Black Level is the lumi-

nance lower bound. Colors in the selected hue range with a luminance brighter than the Black Level

but darker than the White Level will be considered part of the key.

White Level:

This option permits adjustment of the luminance levels of the keyed hue. The White Level is the lumi-

nance lower bound. Colors in the selected hue range with a luminance brighter than the Black Level

but darker than the White Level will be considered part of the key.

Titling alpha:

If you have selected one of the two Titling mode, the titling menu appears.

This option places a transparent black backdrop behind the entire layer to which the key is applied. This

effect is useful for using bright titles on bright backgrounds, such as clouds.

Invert keying:

By default, this mode is disabled. When this mode is activated, the key selection will remain on screen, and

all other portions of the image will be keyed away. For example, you would see the green screen behind the

actor, while the actor would be keyed away.