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.
Gets the horizontal and vertical sampling factor.
Return Values
Returns an associative array with the horizontal and vertical sampling
factors of the image. Throws ImagickException on error.