You can suppress the RGB or CMYw colours in an image. Chroma suppression is useful for removing blue spill from a blue-screen composite.

To suppress a colour:

1. Click Master.

   
   

   NoteChroma suppression can only be applied to the Master tonal range.
2. Enable the appropriate button for the colour to suppress.

   
   

   Enable:	To suppress:
   R	Red
   G	Green
   B	Blue
   C	Cyan
   M	Magenta
   Yw	Yellow

   The status box on the button is light blue when the button is enabled.

   NoteSuppression of RGB and CMYw always reduces luma.