filter allows correcting the colors brightness, gamma and contrast. A
histogram shows the distribution of pixel values globally and for each color.
Controls are not as much sensitive; if you need more correction
This button selects the current channel. It can be : global - Red - Green - Blue.
Corrections are applied to the selected channel.
Corrects the brightness globally and for red, green or blue colour.
Corrects the gamma (mid tones luminance) globally and for red, green or blue colour.
Corrects the contrast globally and for red, green or blue colour.
This value is the reference point for brightness control. Values above are
incremented, and below are decremented. You can also set it to 0 to have the
usual contrast control.
In preview mode, shows the distribution of pixel values from 0 to 255;
globally and for red, green or blue.
Max: is the amount of points indicated by the histogram max value.