These options are common to GEGL-based filters. Please refer to Section 2, “Common Features”.

Calculations may result in too high values and an image too much clear. This option lessens luminosities of the color channels while keeping a good visual ratio between them. So, you can change the relative weight of the colors without changing the overall luminosity.

Coefficient applied to each channel. Values range from -5.000 to 5.000. As default values are equal in the three channels, image is grayed out.