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Animated gif with alpha
I did a search here and didn’t find a complete answer. Here’s what I want to do. I’ve created an animation in AE, rendered it out as a QT or Tiff sequence with an alpha and imported that in ImageReady. When I want to safe optimized as animated gif I can’t find the option for an alpha channel. Only matte, background color, foreground colorand other. If I render straight out of AE I do get an alpha channel but the animation is ugly dithered (even with the dither option unchecked), ugly grads etc. What am I missing?
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5 Replies
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I forgot to mention, I use AE 7 and ImageReady CS2.
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In Imageready’s, assuming you have all your frames imported and you can see them fine on a checkered transprant background:
Go to the ‘Optimize’ palette,
Select the tickmark for Transparancy
then either: use no matte color (none) and enable a diffusion or noise dither for transparancy,
or: use the backgroundcolor of the htmlpage it will be placed in as matte-color and don’t dither transparancy. -
GIF’s don’t have Alpha. You only designate one color as “transparent” and it gets assigned the index 0 in the color table. After that its entirely up to the display device (browser, image viewer) to interpret this index and make it “transparent”.
Mylenium
[Pour Myl
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You’ve got me confused here. When I render straight out of AE and drop the animation in a browser window to check, the alpha channel is working. But everything looks ugly because of heavy dithering. From searches here on the cow I learned it was better to render out as a QT or tiff seq. (with an alpha) and take that into IR. Once there I created a new document with transparency. But when I import the sequence I loose the checkerboard background. I’ve tried several options for matte: none and background but still no result. Choosing a specific background color is no option because the animations are placed on the gradient background of a Powerpoint presentation. The placement (and size) is out of my hands so I defenitly need an alpha. So, what can I do?
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You can only use matte=none and a Dither method for transparancy.
Like Mylenium said: Gif has 1 bit of transparancy.I know, it looks ugly, but that’ s what you get for using a technology from 1989.
I’ve tried supplying quicktimes with alpha for use in Powerpoint, with quicktimes using the animation or PNG codecs, but transparancy seemed to flash in and out when the animation starts
I guess that’s what you get for using an app from 2002.In Keynote it works very nicely 8-/
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