7. The Menus / 7.5 The Layer Menu
Color Filter controls the visibility of a layer on a per pixel base.
With Layer you can define which color values a layer pixel must have in order to be visible, and with Background you define which color values a background pixel must have, so that the corresponding layer pixel is visible.
There are 3 possible color modes to lay down the visible color ranges:
If you apply Fix Layer (see chapter 7.5.26) to a layer with a color filter, the color filter will be converted to a layer mask (see chapter 2.8).