These options are common to GEGL-based filters. Please refer to 第 2 节 “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.