Rendering Original Frame States
Zoner GIF Animator 5 has a very useful function for taking an optimized but hard-to-edit aGIF, and making it easy to work with until you're ready to re-optimize: for rendering, i.e. restoring, its original frame states ("animation states").
It often happens that you need to change something in the animation you've worked so hard to create. An animation can't be edited after it's been optimized, and Murphy's Law dictates you'll already have deleted the source files.
Zoner GIF Animator 5 can help. Open the GIF from which you need to obtain the original animation states. Select the frames for which you wish to obtain original states (or all frames, using the Ctrl-A shortcut), and then the Frame | Render Animation State menu item. The selected frames will be rendered in full quality.
This function can be used on all animated GIFs, even ones that were not created in Zoner GIF Animator 5.
Animation to be Edited:
Optimized Frames:
After being changed using Render Animation State:

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