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Color Swatch

Color Swatch is mainly used together with the two chroma key plugins. It should be applied first so that its output becomes the input for the chroma key.

Constant Brightness:
  creates the HSV color wheel in which the brightness is constant and you can only move the Brightness slider.
Costant Saturation:
  creates the HSV color wheel in which saturation is constant and you can only move the Saturation slider.
Angle:
  turns the HSV color wheel by a certain angle.
Draw Source:
  is analogous to vectorscope; shows the pixels of the upper track (figure + background = source) superimposed on the HSV color wheel. It basically displays the source colors that are also present in the color wheel, but not the others. You can easily see which colors fall within the wedge (mask) and are therefore extracted, while those outside make up the unextracted figure. This makes it easier to adjust the key color and the hue range according to our needs.