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This node uses a curve to remap the values of the input image's pixels. Each of the input's channels (red, green, blue, transparency) is handled independently of the others.
The x-axis of the curve represents input values, and the y-axis represents outputs. If
the above curve were used, then for a pixel that had a channel of brightness 75%, the
corresponding pixel-channel in the output image would have a brightness of 95%.
If the curve is a standard upward ramp, then the image will remain unchanged.
If the ramp is inverted, the image's colors will also be inverted.
A step-curve will give the tonal variations of the image a step-like appearance.
This node takes one input providing the image to be adjusted.
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