Keying all but one colour to grey

[Kevin Camp]

in the color corrections effects, there is an effect called leave color… select the color you want to keep, then set the amount to decolor the rest of the footage. there are adjustments for tolerance and edge softness and you can choose between matching rgb or hue values.

[Roland R. kahlenberg]

This COW Tutorial should help you out –

https://library.creativecow.net/articles/kahlenberg_roland/coolsville.php

Cheers
Roland Kahlenberg
https://www.broadcastGEMs.com – Adobe After Effects project files
https://www.myspace.com/rorkrgbspace

[James Zwadlo]

thanks guys 🙂