Complex sentence: This is a method that can be both used for RGB and HSV color space colorspaces, the basic idea is that one defines a angle in the hue circle within the HSV colorspace, this angle is your chromakey.
Split into simpler sentences: This is a method that can be both used for RGB and HSV colorspaces. The basic idea is that one defines a angle in the hue circle within the HSV colorspace, this angle is your chromakey.