Animation is a lossless codec. Really lossless, not just “perceptually” lossless. But the compression isn’t so great for photorealistic images, so the files tend to still be quite large… unless the images are large expanses of uniform color, like in a cartoon. Animation rocks for, well, animations.
JPEG is a lossy codec, but it’s quite efficient. The images will lose some information, but the files will be a _lot_ smaller. It’s designed for photorealistic images, _not_ for sharp graphics, like vector graphics.
You said ‘JPEG sequence’. Just to be clear, an image sequence is a sequence of many, many separate files: one per frame. You cna also use the JPEG codec within a QuickTime container, so you just have one movie file, but with the frames inside of it encoded with JPEG.
And ProRes is a pretty advanced family of codecs that makes good tradeoffs between image quality and file size for professional video.
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Todd Kopriva, Adobe Systems Incorporated
Technical Support for professional video software
After Effects Help & Support
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