This advanced iMovie plug-in is a more specialized version of our general-purpose plug-in, "emphasis". Instead of emphasizing strong colors, you now choose which color to accent by boosting it. As with all our smart plugs-ins, you can tell it to also affect similar colors.
What should i use it for?
Use this plug if you want to accent a certain color (or color range) or reduce the prominence of a color in your clip. Use it also to create special posterize effects.