Warning: This function is
currently not documented; only the argument list is
available.
Warning: This function is
EXPERIMENTAL. The behaviour of this function, the
name of this function, and anything else documented about this
function may change without notice in a future release of PHP.
Use this function at your own risk.
Compares each image the GIF disposed forms of the previous image
in the sequence. From this it attempts to select the smallest
cropped image to replace each frame, while preserving the results
of the animation.
Return Values
Returns TRUE
on success.