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With the “Preserve Luminance” checkbox turned on, any channel adjustment you make is prevented from altering the luma of the image by automatically raising or lowering the other two channels to compensate. In the following example, you can see that when “Preserve Luminance” is turned on, lowering the Green control group’s Green slider results in the Red and Blue channels being raised by the same amount (as seen in the Parade scope). Conversely, raising a color channel’s slider ends up lowering the other two channels by the same amount to keep overall image luminosity the same.
The result of an RGB Mixer adjustment with “With luminance level preserved” turned on. You can see that lowering the green channel slider also raises red and blue.
Resetting the RGB Mixer
Clicking the Reset button at the top right-hand corner of the RGB Mixer resets each slider to its default position, where Red = 1.00 for Red output, Green = 1.00 for Green output, Blue = 1.00 for Blue output, and all other sliders = 0.
Swap Channels Buttons
A set of three buttons at the bottom of the RGB Mixer lets you easily swap two channels with one another. This can be useful as part of a creative look, or corrective in instances where two channels are accidentally reversed.
— Swap Red and Green: Swaps these two color channels.
— Swap Green and Blue: Swaps these two color channels.
— Swap Red and Blue: Swaps these two color channels.