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Click the tone-curve/histogram button to display the palette.
THE TONE-CURVE / HISTOGRAM PALETTE
Reset buttonAuto-setting button
Output shadow and high-
light text boxes
Output shadow and high-
light sliders
Input shadow, gamma,
and highlight sliders
Input shadow, gamma,
and highlight text boxes
Histogram
Apply button
White, gray, and black-
point buttons
Tone curve
Smooth curve button
Freehand curve button
Channel list box Color-histogram button