(PECL gmagick >= Unknown)
Gmagick::scaleimage — Scales the size of an image
Scales the size of an image to the given dimensions. The other parameter will be calculated if 0 is passed as either param.
width
The number of columns in the scaled image.
height
The number of rows in the scaled image.
The Gmagick object on success.
错误时抛出GmagickException.