I have a very large image ( >500 Mo !) containing a series of smaller images of the same size, in mosaic, as follows:
[ 1 2 3 ] [ 4 5 6 ] [ 7 8 9 ]
But in my case, there are hundreds of them.
I would like to make a gif of all the images, in the right order (1 to 9 here). I thought I could use GIMP to do this, but the only task of extracting the images looks complicated, so it may not be the way to go.
How should I do ?