Adding Grading FX to Spectramatte (Chroma Key)

[Michael Hancock]

Here’s how to workaround your problem:

V1 is your background.
V2 is your Key with Spectramatte.
Duplicate the footage on V2 and put it on V3. Change the Spectramatte to show the Matte. V3 is now a black and white image of your key–the matte.

Remove the Spectramatte effect on V2 and apply your color correction. Collapse V2 and V3, then apply a Matte Key effect (Don’t Alt+Drag the effect–it will nest it and not do what you want, just drag the effect over the submaster).

This will replace the submaster effect with your matte key effect. The Matte you had on V3 now acts as the alpha for V2 (video only with Color Correction), and it doesn’t effect your background.

That’s how you color correct with Spectramatte without effecting your background!

Michael.

[Alex Bond]

Michael,

Thanks for this it worked.

I need to have the matte and greenscreened segment move though and this is proving difficult. The green screen part is a model moving from right to left on screen and scaled slightly to fit in with the background footage. However when I applied the move and scale to the new top layer, the matte moved but the girl did not. When I went back a few stages and animated both the girl and the matte (ie animate the spectra matte, write down the position and scale parameters and put the EXACT same numbers into a resize on the new layer to match the movement of the flattened matte) the two don’t move at the same time and double edges appear.

It seems as though the resize and Specra Matte parameters are not exactly the same.

Alex