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7.4 Removal of Keying Colour Remains (Despill)
Once the correct mask is set, the functions in the Spill correction section will eliminate the
reflection of the colour of the keyed background in the object.
Impact of the background colour on the object – a view before a Despill correction
Despill color and Despill coarse belong to the functions for the preliminary elimination of
unwanted colours, and are based on the RGB space.
Once the Despill color slider is moved to position 0 (the left-hand side), the algorithm will
automatically remove the green colour component if this is the keyed colour (similarly –
blue if the background is blue). Once the Despill color slider is moved to position 1000 (the
right-hand side), however, the algorithm will automatically add the red colour and the blue
colour (if the keyed colour is green) or red and green (if the background is blue).
The value of the algorithm is controlled by means of the Despill coarse function.
If the keyed background is green, after a certain threshold of the Despill coarse function is
crossed, the green component is entirely eliminated from the object in the RGB (red, green,
blue) space, which results in the transition of colours into the purple (magenta) area.
The Despill color/Despill coarse slider section
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