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Animated GIF question from a complete beginner

Jun 9, 2011, 23:18 (This post was last modified: Jun 9, 2011 23:19 by duddles.)
Post: #1
Animated GIF question from a complete beginner
Hi, I have just started using GIMP with the goal of making an animated GIF. I was first trying just to animate two pictures:

1.gif http://i.imgur.com/dCtZX.gif
2.gif http://i.imgur.com/smzBv.gif

I first open 1.gif and then 'opened as a layer' 2.gif
(when I do this it looks like the two images are superimposed on each other - like this: http://i.imgur.com/uLLzM.gif)

I then tried 'Save as Animation' with the option of 'one frame per layer (replace)' and 'use disposal entered above for all frames'.

The result looks like: http://i.imgur.com/mCqZk.gif where the first frame looks normal but the second looks weird

I would really appreciate any help!
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Jun 9, 2011, 23:46
Post: #2
RE: Animated GIF question from a complete beginner
(Jun 9, 2011 23:18)duddles Wrote:  Hi, I have just started using GIMP with the goal of making an animated GIF. I was first trying just to animate two pictures:

1.gif http://i.imgur.com/dCtZX.gif
2.gif http://i.imgur.com/smzBv.gif

I first open 1.gif and then 'opened as a layer' 2.gif
(when I do this it looks like the two images are superimposed on each other - like this: http://i.imgur.com/uLLzM.gif)
This isn't normal, you should see only the top image, without any changes.. Is the top image in a mode other than "normal"?


(Jun 9, 2011 23:18)duddles Wrote:  I then tried 'Save as Animation' with the option of 'one frame per layer (replace)' and 'use disposal entered above for all frames'.

The result looks like: http://i.imgur.com/mCqZk.gif where the first frame looks normal but the second looks weird
It's consistent with what you see in Gimp, at least.

Actually I think that your problem is that you have two independent GIF to start with, with different color tables, and Gimp will only use one of the two (and in an animated GIF you also have one single table...). So you have to convert one of the image to use the same table as the other(*). Ideally you start over from non-indexed images (PNG/JPG/TIFF...) and convert them to indexed together, so that the same table is used for all.

(*) I'm not expert enough in GIF to tell you how it's done, unfortunately

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Jun 10, 2011, 00:34
Post: #3
RE: Animated GIF question from a complete beginner
Thanks for the reply. I am starting out with PNG files (I converted them to GIF in Paint.NET) so maybe I can try what you said about converting them to be indexed together. But I am not really sure how to do that in GIMP - can you give any advice on that?
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Jun 10, 2011, 00:52
Post: #4
RE: Animated GIF question from a complete beginner
(Jun 10, 2011 00:34)duddles Wrote:  Thanks for the reply. I am starting out with PNG files (I converted them to GIF in Paint.NET) so maybe I can try what you said about converting them to be indexed together. But I am not really sure how to do that in GIMP - can you give any advice on that?
Use Image/Mode/Indexed. Do it as late as possible because many things cannot be done in indexed mode. If you use the default indexing settings, you can even keep you image in RGB all the time, and export it to GIF directly, the conversion will automatically happen then.

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Jun 10, 2011, 01:06
Post: #5
RE: Animated GIF question from a complete beginner
Thanks a lot - I tried it out and it works!

I really appreciate the help!
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