Hi Bruno
How are you going?   You were pretty quiet for a week or two.   You should try and drop us a reply whenever you can,  just so we know you're OK.
That animated GIF of Penny is supposed to look 3D - it's a technique I came across a couple of years ago on the Net - and have experimented with from time to time - usually when I see one on the Net and it inspires me to try again - which I did at Flickr.com today.
It's quite easy to do - all you have to do is take a couple of photos of the same thing and just move the camera sideways very slightly to change the angle/perspective of the 2nd shot.   Using a photo-editing program I then align both the images of Penny as perfectly as I can - some things will line up and other outside things will be apart.   You crop them the same size and save them as GIF files.
An animated GIF is just several image frames - GIF images (just a different format from JPEG, usually less colours) showing one after the other - repeated - and there are many programs that will compile them together as the one file.   I use a simple, small, free one called UNFREEZ GIF I found years ago.   You just drop the GIF files in it - set the time in milliseconds between each one - and click 'create' - and seconds later there is a new file made up of the several images as an animation.
Like a video - the more separate frames - the smoother the GIF animation - so only two tends to be a little jerky (or as these are sometimes called, 'wiggly' or 'wigglies') - but it gives the 3D effect.
The more files in a GIF animation like the frame around this letter - (which has 24 different frames running in about a second) - the smoother it will appear to change - but it means that the file will be bigger - because it is 24 separate images.
And of course if the images are big like the one of Penny it can be a very large finished GIF file of several Mb.   That's why most animated GIFs are fairly small in size - or just a few frames repeated.
Here is a link to an email page I did some time back when I first found the technique - and some good examples and a few of my rough attempts - HA! HA!
(Email Newsletter with 3D animated GIFs)
I still think this is one of the best
and it was the first I saw.
2 images with the camera position
altered just a fraction
We are supposed to be in for a week of beautiful, sunny, early summer days - and if they are all like today it will be a very pleasant time.
until the next
from your friends
Rodney & Penny