View Full Version : Difference matte, opinions?

05 May 2005, 09:33 PM
wow this section of CGtalk has really picked up since last time ive been here!

Ive learned in FCP and in Shake (gotta love student discounts) there is a nifty little thing called difference matte, where you take a reference frame, and then compare it to your video. It keys out all the backround, as long as the camera remains still.

How well does it work? Im not in the position right now to try it, im working like crazy to finsih up a project due tmr. looking back, our green screen worked OK, not the best. I love the primatte keyer, but if the difference keyer works just as well thatd totally rule.

I only post here because i cant remember which other NLE's ive worked on have this, and i never messed with it.

Thanks in advance.

05 May 2005, 12:37 AM
I'm no authority on the matter, and you'd get a much better response posting in the compositing forum, but generally working with difference mattes can be pretty iffy, particularly if you're shooting on a dv camera. I think they work by comparing each individual pixel in two images, then keying out all those found to be mathematically identical, or very similar. But the difference keys I've tried in the past have always been really rough, with a lot of noise and edge fringing. Stick with Primatte

05 May 2005, 09:24 AM
well i think ill a green screen/difference combo

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05 May 2005, 09:24 AM
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