User guide

KeylightThe Foundry

TUTORIAL

Tutorial 5: Inside Mattes

The grey squares in the foreground, where the colour swatches are

located, tell us that the background will show through here The green

pixels are a warning.

Figure 87. Despot.

They are showing us the parts of the Screen Matte that we have changed

due to processing the matte in steps 5 to 7. These areas have had the

correct amount of spill removed, but the alpha has subsequently changed

and the composite may no longer look right. We can correct this with the

replace colour.

8. The composite is shown in Figure 88. You will see that the colours of the

colour swatches have been altered by the Keylight algorithm. This can be

fixed with an inside matte and replace colour.

Figure 88. Composite.

9. From the Inside PPG pull a key of the foreground. You’re trying to pull a

very specific key of just the colour swatches. So set the Colour

Differentiation to fine and pick carefully. If you get it wrong use the Pick