Make sure you have the static image open but use the function on the white background image. Now it’s time to use the move path function. We’ll create a 20 frame animation, so the first thing will be to copy the first frame 19 times using the video/duplicate frames function. GAP has series of functions to help you manage frames. You don’t have to copy the file yourself to add a frame. xcf images, so that you can work with layers the same way as you do in static images. The rest needs to be exactly the way shown. Create a separate directory for the file, it will fill with many frame files soon. To be able to work with GAP you need to save it in GIMP’s native format. This will create a new white image we’ll use as a base for our animation. Now drag the background layer from the static image to the GIMP toolbar. Gimp will download the compressed image and open it for you. In GIMP, choose Open Location from the toolbox File menu and paste the URL there. In case this doesn’t work for you, copy the link by selecting Copy Target or Copy Link Location from the image context menu accessible by right-clicking on the image. To load it into GIMP, just drag the image above to the GIMP toolbox. To make things easier, we’ll start with a ready-to-go static image. Please go to the “ Using GAP” tutorial to learn more about the tool. The key function of the GAP is the move path dialog. That’s why we’ll start with a little theory before we move over to the practical part. It is very advanced, but the user interface might be confusing for some at first. Here you’ll learn how to use the GAP, GIMP animation package. Welcome to the advanced GIMP animation tutorial. Unfortunately, there's not a lot you can do about that, except to choose a more suitable background or to re-render the animation.Text and images Copyright (C) 2002 Jakub Steiner and may not be used without permission of the author. This is OK as long as the background you're showing the animation on isn't too far from the original background color, but if it is, you may find that there will be some ugly color fringing around the edges of the animation. You can't actually tell the difference by eye (or, at least, I can't do that on this screen), but it's enough to make GIFsicle consider the two colors different.Īlso note that GIF files only support 1-bit transparency, which means that the edges of the transparent regions will not be anti-aliased. very slightly yellow-greenish white) rather than #ffffff (pure white). For example, for the animation shown above, the actual background color turned out to be #fdfffc (i.e. One detail worth noting is that, if the GIFsicle command doesn't seem to have any effect, you should check that the background color is really correct. Original animation by Wikimedia Commons user WillowW, used under the CC-By 3.0 license. The -O2 option is not strictly necessary, but it's likely to shrink the file size of the resulting animation by optimizing the frames to avoid needlessly re-drawing static parts of the animation.)įor a demostration, here's an animation of the human glyoxalase I (GLO1) enzyme from Wikimedia Commons (left), and the same animation with transparency added using the method shown above (right): This allows extra transparency to be added to the frames without letting the earlier frames show through the transparent parts. (The important options here are -U / -unoptimize and -disposal=previous, which together convert the animation into "flipbook mode", where each frame is fully erased before drawing the next one. ![]() Where anim.gif and anim_trans.gif are the source and destination file names, and #ffffff is the hex code of the color you want to make transparent (here, pure white). ![]() You can do this with GIFsicle, using the following options: gifsicle -U -disposal=previous -transparent=" #ffffff" -O2 anim.gif > anim_trans.gif
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