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Strange alpha-channel elements dissolving oddly…
I’ve got some elements over a background that I’m trying to dissolve together and a few of the elements are dissolving rather quickly.
What am I doing wrong? What did I forget to do?
I’ll post a clip of it
https://homepage.mac.com/captmench/Dissolve.mov
Thanks…
CaptM
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3 Replies
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Rather than dissolve the elements, if you want them to dissolve to black why don’t you just fade a black layer up from 0% to 100% on top of the layers?
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Excellent point.
I’ll give that a try — I’ll have to adjust the text as it’s a 3d element too and therefore would also be affected by the solid.
But will give it a try.
Thanks
CaptM
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Another thing to keep in mind is that AE works with opacity in mysterious ways. A layer with 50% opacity let’s 50% of what’s behind it through, which makes sense when you consider one layer with 50% opacity alone.
However, this means that if you put two layers, both with 50% opacity on top of one another their aggregate opacity will not be 100% but 75% (they will allow 25% of what’s behind them through, 50% * 50% = 25%). This is an approximation of the way light behaves in the real world.
So if you have 4 layers on one side of your comp that are all decreasing their opacity at the same rate, and 2 layers on the other side that are doing the same (say from 100% to 0% over 2 seconds). We use the inverse of the opacity to determine transparency in the parentheses below (100 – Opacity) = Transparency for each layer:
Side A at 0 seconds will be 100% opaque (0% * 0% * 0% * 0% = 0% transparent)
Side B at 0 seconds will be 100% opaque (0% * 0% = 0%)So far so good…
Side A at 1 second will be 93.75% opaque (50% * 50% * 50% * 50% = 6.25% transparent)
Side B at 1 second will be 75% opaque (50% * 50% = 25% transparent)Uh-oh!
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