I've read some time ago about the idea of generating a thumbnail image from a bigger image not starting from the top left corner but from the center of the bigger image.
Can anybody tell how to do that with php?
For resizing of any kind, you usually use one of the imagecopy methods:
imagecopy ( resource $dst_im , resource $src_im , int $dst_x , int $dst_y ,
int $src_x , int $src_y , int $src_w , int $src_h )
The src_ parameters specify what part of the source image to copy. Just make that anything other than 0, 0.