In that mode, paint tools only fill transparent pixels, partially fill partially opaque pixels to "complement to opacity" with the new color, and leave alone the opaque pixels. To fill the background, we could just add a layer filled with the new background color, move it to the bottom of the stack and merge everything, but there is a faster method: use the Behind mode of the bucket-fill tool (the "mode" is the selector at the top of the Tool options). So we can bucket fill the whole layer with the new color, the color will only "stick" on the opaque pixels (and stick partially on the partially opaque pixels): When it is set, the opacity of the pixels cannot change. Just click on the As Animation checkbox - it will enable the animation options (and actually save an animation, instead of a flatenned GIF image) That is your answer - but taking the opportunity of the question repeat an information that is somewhat hard to find or understand: if you want to customize the frame duration of any. The alpha-lock is the checkerboard icon in the "lock" line at the top of the Layers list. We can then paint with the same opacity by setting the alpha-lock on the layer. The problem is, the dithering tool in GIMP is inferior to what Photoshop (or other programs) can do and your gifs can end up looking kind of crappy (depending on the. gif you have to convert from RGB mode to Indexed mode due to the 256 color limit of the gif format. The remaining pixels have exactly the opacity necessary to recreate the text: So if you make gifs in GIMP, you probably know that before you can export as a.
We use Colors>Color to alpha to remove the background color.
#Gimp gif backwards series
Note that this technique works to change foreground/background to any color, not just to exchange them. I made the second half of the frames series a backwards copy of the first half of the frame series so the aurora doesnt stop somewhere and jerk back to the first frame. So what we need to do is to recover that opacity, and use it when repainting with new colors. The basic principle is that the text is made of pixels of varying opacity (fully opaque for most, but partially opaque on the edges) overlaying a background. In such a simple image, not very difficult.
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