Set the tools to the "By Color" selector.Set Gimp background color from the background color of your image (#eeeeee).This create a new image, you can close the source one. Remove the optimizations: Filters>Animation>Unoptimize. However there is a script that makes this a bit faster if used right:
For a single layer, that means Select the background,Select>Grow by two pixels, andColors>Color to Alpha` but this will be long for 68 layers. So the light gray things will remain opaque, and we want to remove the background but prevent Color-to-alpha to change the light gray things into be partially opaque pixels. Export as GIF, don't forget to tick the animation checkbox, and to force all frames to 40ms (the optimization sets a longer interval).This will create a new image, use Filters>Animation>Playback to check it. Image>Interleave layers>Interleave single layer (sprite mode) and select the white layer.Add a layer filled with white (or your new background color).Dark grey can darken to black, but don't panic. Colors>Color to Alpha All layers and remove the background (color-pick, it should be #EEEEEE).
GIMP GIF BACKWARDS FULL
Change image to full RGB: Image>Mode>RGB.Remove the optimizations: Filters>Animation>Unoptimize.webm before conversion: and here, after the conversion to. But the effect was very bad, here is a screenshot of. gif in a GIMP frame by frame, so I thought about converting this webm to gif.
But in a GIF, there are no partially opaque pixels, they are fully opaque or fully transparent, so you can't have shadows. I wanted to edit it, to create a simple funny animation/meme. In the picture above the shadows would be implemented as partially opaque pixels, that would slightly darken the pixels of the background. When you want a transparent background, you want to be able to show the picture over any background. Then a transparent background is not doable for this particular GIF. It depends if the light gray things are shadows or not.
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