CGTalk - straignt alpha channel

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archemedes

09-27-2004, 08:11 PM

I have been trying to export a straignt alpha but can't seem to do it in LW 8? Is it even possible. I even tried fader alpha mode. I am animating a nice smooth curve that is being composited in after effects. The animation need to be clean without premultiplication. Any help in this area would be great. Thanks

Eugeny

09-27-2004, 09:01 PM

Use image filter "SpriteEdger" ... its can eat BG color from the antialiased pixels.
The result is pretty strange , but after composting everything looks OK.

archemedes

09-29-2004, 04:12 AM

thanks!!! this worked like a charm. I am not complaining but doesn't it seem that this should be an alpha channel option?

Eugeny

09-29-2004, 12:08 PM

In alpha u have 8 bit channel information i. e. u don't have access to "colored" pixels , u can only make them transparent .
Another method is rendering against gray (128 128 128) background

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