Didn’t have much to do today, so I took a quick shot at it.
Drag 3 copies of clip into timeline. Apply leave color to both layers.
On the top layer select a green from the grass.
Amount to decolor = 100%
Color to leave = 10%
tolerance = 20%
Middle layer-select orange from shirt.
Amount to decolor = 100%
Color to leave = 15%
tolerance = 20%
Set top layer to overlay. Precomp top two layers. Add “set matte” effect and use blue channel as matte and then invert matte. Add levels effect, and switch to alpha. I set imput black to 69, and imput white to 152.
Now use the precomp as a alpha matte. Still some masking involved, but a whole lot less. I didn’t spend a ton of time selecting the colors to for the “leave color” effect or playing with the tolerances—so if you play around you may get some better results, but, you’ll have removed almost all of the sky this way.
Johnny Cuevas, Editor
http://www.ckandco.net