I'm compositing a 3d motorbike model into a jpg background image in photoshop cs4.
I've made a shadow pass in Maxwell render, but it's not the colour I need to match the other shadows in the background.
Shadow pass is grey the jpeg shadows are a dull green.
How can I change the colour of the whole shadow including the pixels around the edge where it gradually fades to white, but still have it gradually fading to white.
The best I've managed is just to select the outline of the shadow (as accurately as possible), fill that area with one solid colour of green then blur the edge later.
But that defeats the purpose of having an accurate shadow in the first place.
Here's the shadow map :
Here's the background image :