Hello experts,

I have a problem with a rotating logo.. (akazia_logo_v5.xcf) -> http://www.agenda21-bad-urach.de/demo.html. I rotated it by 5 degres each over the full 360 cirlce, I scaled it down and indexed the colour (sorry this might not
 be the correct word in English) and created the gif with 50ms per frame.

looks fine.

Now when you look at the result akazia_logo_v5_ani_demo.gif -> http://www.agenda21-bad-urach.de/demo.html
you can easily see how bad it comes out:
- the text akazia is no more readable
- the "frame" in has got steps when it rotates
see below for the explanation...

- at 90 and 270 degre there is a too long gap where nothing is visibable though I have set the 90degre frame to 88 and 270 to 268 resp. -92 degree
To me it looks ok. You could make these frames shorter in time or paint the line by hand to give a thickness to the plane.

I think this are "user" issues I just can not find out by try and error how to make it better. Has someone a hint what I can do? My assumption is not that nessesarly the downscale is the reason - I think already the induvidal frames could be better. This leads to the question in which size and resolution (dpi)

First I thought you had either used a bad downscale ("nearest neighbor" instead of "linear" or "cubic") or a bad indexing (the gif uses only 16 colours), but after playing with your xcf, I understand the problem:

You are trying to make a transparent gif. The problem is due to the gif format. The only way to solve this is to forget about transparency and make any frame opaque with the colour you want to use on the web page.
Gif cannot handle real transparency, just a cut-through illusion.
You are hitting a fundamental limitation of GIF.

I need to create the base and if there are does and donts for the rotation to get a better result. And last: I created 72 frames manually - is there a tool to automate this ???

You can script it with script-fu, and perhaps python-fu (depends on your OS, I think it's not yet ready for windows) and perl-fu.

Thanks a lot
Best regards,


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