color exchanger for Mac

From cf/x:

color exchanger is a special effects iMovie plug-in that lets you exchange all pixels in a picture that match one color with another color. you may tell the plug to allow the color some 'leeway' in matching, as well as allowing up to the same leeway to be applied to the exchanged color.

for example, imagine you had a clip depicting a fire and you wanted the flames to look green. now, target the fire's orange glow, allow some leeway so all flames are exchanged, select a nice green, and let the plug do it's magic. soon, you have a nicely green fire in your clip.