![]() ![]() Frame control chunk (fcTL): The frame control chunk precedes each frame contained in the APNG animation. It shows the number of frames that make up the animation and also describes how often the animation should be played before it stops. I'll probably try taking out some frames and see if I can get the size down that way. Animation control chunk (acTL): This block informs the parser that the PNG is animated. I thought I'd done this before (a year or two ago) but must have misremembered the circumstance. I assume you know that you need to add an alpha channel (Layer > Transparency > Add Alpha Channel) to create transparency.as I wrote in # 3 and expand here: I had a misunderstanding of how it worked and thought that there was a way to use one frame as a background for all the other frames (each of which have transparent elements), this being done so because without this approach the gif is too big. That way you can create a 12 second animation using only a few frames, because the delay does not have to be constant. Last edited by SeijiSensei April 11th, 2012 at 06:40 AM. In every GIF animation you are allowed to specify the delay between frames. I assume you know that you need to add an alpha channel (Layer > Transparency > Add Alpha Channel) to create transparency. GIMP's differencing engine will then determine which pixels can be made transparent and which must change from frame to frame. I make these by stacking the opaque frames up as layers then saving as a GIF. In comparison, it's harder to ignore the repetition of the motion of Nodame's hair in the fourth animation. If you only saw Chizuko's hair and the flames, you be more apt to notice that the animation repeats the same sequence of frames endlessly. We don't really notice the transition back to the beginning of the sequence so the image looks to be seamless. In this tutorial I’ll be demonstrating how to create animated GIFs with GIMP so. The third example demonstrates how our minds create the illusion of continous motion. One of the lesser known features of GIMP is its ability to create animations. The main thing that differentiates the "background" frame in this case is that it remains on-screen for a longer period of time. For animated gif, this is 256 colors per frame however, GIMP does not support exporting each frame with a different set of 256 colors. The second is more complex because each frame is substantially different from the preceding one. The rest of the sequence is differenced against that. In the first one, there's only one opaque background frame. Here are a few examples that you can examine in GIMP using the Layers window: The differencing engine should preserve the initial white background and make a sequence of differenced layers that are largely transparent. You need to stack the sequence of opaque images, then tell GIMP to save as a GIF. I suspect you didn't do the differencing properly. The problem with your spinning image is that the white background is only in one frame. ![]()
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