An animation I did, starts with 16 frames of the exact same image. Then, 10 frames of a fade to 50% dark. Then 10 more frames of no change, etc. I did it this way, because, apparently, an Adobe Animate GIF animation can have only one frame rate -- even though it's possible to set varying frame rates in an animated GIF.
When I export this as an Animated GIF the file size is rather large. In my search for ways to reduce this file size I discovered that all those frames where nothing changes are NOT being optimized. In other words, the Export utility is not collapsing these frames, to conserve file space [like another GIF Animation tool I occasionally use]. How did I determine this? I tried chopping out, all but one frame, in each of the places in the animation, where nothing changes, and the files size shrank by a factor of 6!!
Am I missing some optimization setting, or is this just a limitation of the software?
Another thing I can do in this other GIF Animation program I own is: Set individual frame rates for frames in the animation. There doesn't appear to be a way to do this in Adobe Animate.
Why don't I just use my other GIF Animator? Because doing so would involve another tedious step: I would have to save the GIF from Animator, then load it into my other GIF Animator, and then delete the superfluous frames, then set a slower frame rate on the remaining frames. It would be so much nicer of Animate did this.
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UPDATE: I actually tried loading a file, created by Adobe Animate, into my other GIF Animator, and did what I discribed, above, and sure enough, the file size went from 2.31MB, to 461KB! That's a 501% resuction in file size!!
And, in case you don't want to have to re-read the above, to know what I did to get this MASSIVE reduction in file sze:
1. I loaded the GIF file into my other GIF Animator [a REALLY OLD program by JASC [defunct] called Animation Shop [because it's SUCH a good program!]
2. I deleted duplicate frames.
3. I calculated a new frame rate for each section that I deleted duplicate frames from.
4. I changed the frame rate of the remaining frames [that were once part of a redundant set].
5. Saved it as a new GIF file.
It looks exactly the same as the original Adobe Animate output, but it's 501% smaller!!
And, doesn't it seem like Animate would be the more likely place for that kind of functionality to be?