The Color Correct Histogram UI displays the input and output level adjustments for the selected tonal range and channel, as well as the histogram for the selected channel. The Ranges tab also displays the histogram for the selected channel, as well as the Shadows, Midtones, and Highlights curves.
The four Tonal Ranges selectors select the tonal range to operate on, namely Master (all pixels), Shadows, Midtones, and Highlights.
The four channel selectors select the channel to operate on, namely luminance labelled Main, Red, Green, and Blue.
There is one set of input and output levels adjustments for each channel of each tonal range for a total of sixteen sets of input and output levels adjustments.
(a) Input (b) Output
See Adjusting Color Values with the Histogram for information about setting the sliders.
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