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# Suppressing Colours

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.