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QT vs jpg renderings


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Is there a coherent explanation somewhere on the differences in which jpg images of renderings and QuickTime images are prepared? I created an animation by stitching together a series of exported jpgs, and was at less than 1/2 Mg for the first dozen of them combined. Then I used QTWriteFrame in a script to build a movie, and at as close to the same quality as I could approximate, was at 2 Mg for the same length movie. I'd like to use the QT because it can be fully scripted with VS, but it seems I'm having to sacrifice either quality or file size to do so. It comes down to, how is an image written to a QT movie by VW different from an image exported as a jpg (or any other file type)?

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