Re: Keying water by david bogie on Jun 19, 2009 at 2:24:30 pm
You'll need to explain the situation as you seem to be asking if the water can be keyed out. If the water is sufficiently pigmented, it's easy.
If you're asking if the water can be keyed out as water, key everything else out and reversing the alpha. Easy.
Re: Keying water by Scott Hathaway on Jun 20, 2009 at 4:19:51 pm
I succeeded in this effect by shooting the water on a sunny day in broad sun lit with a harsh mirrored backlight against a completely black, shadowless background. I then used the screen blending mode over my footage and got the results I wanted. By crushing the blacks a little the outcome was perfect. Furthermore I pre-comp'd the water layer and applied a displacement map to the background footage and mapped it to the water layer and adjusted the x and y distort thereby effectively 'refracting' the background image through the water.
