Levels parameters. Points are sRGB-encoded values in [0, 1] (multiply by 255 for the familiar 0-255 scale); gamma is the midtone gamma (> 1 brightens).
gamma
Optional
Input black point, 0-1. Default 0.
Input white point, 0-1. Default 1.
Midtone gamma, 0.1-10. Default 1.
Output black point, 0-1. Default 0.
Output white point, 0-1. Default 1.
Levels parameters. Points are sRGB-encoded values in [0, 1] (multiply by 255 for the familiar 0-255 scale);
gammais the midtone gamma (> 1 brightens).