QuickTime 4 Reference

RGB Balance Filter

kRGBColorBalanceImageFilterType ('rgbb')

The RGB balance filter allows you to independently adjust the red, green, blue, and alpha channels of a single source. The effect adjusts every pixel in the source, multiplying the red component of the pixel by the value of the red multiplier parameter, the green component by the value of the green multiplier parameter, and so on.

The RGB balance filter takes a maximum of one source and has three parameters.

Parameters

Use the descriptions below to help you understand what the parameters do. To learn how to use parameter atoms, see "Adding Video Effects to a QuickTime Movie"

Name	Code	QTAtom Type	Description
Red multiplier	`'rmul'`	`kParameterTypeDataFixed` Can be a tween	The amount to adjust the red channel value of each pixel by.
Green multiplier	`'gmul'`	`kParameterTypeDataFixed` Can be a tween	The amount to adjust the green channel value of each pixel by.
Blue multiplier	`'bmul'`	`kParameterTypeDataFixed` Can be a tween	The amount to adjust the blue channel value of each pixel by.

Name

Code

QTAtom Type

Description

Red multiplier

'rmul'

kParameterTypeDataFixed

Can be a tween

The amount to adjust the red channel value of each pixel by.

Green
multiplier

'gmul'

kParameterTypeDataFixed

Can be a tween

The amount to adjust the green channel value of each pixel by.

Blue multiplier

'bmul'

kParameterTypeDataFixed

Can be a tween

The amount to adjust the blue channel value of each pixel by.