(PECL imagick 2.0.0)
Imagick::getPixelRegionIterator — Get an ImagickPixelIterator for an image section
Get an ImagickPixelIterator for an image section.
x
The x-coordinate of the region.
y
The y-coordinate of the region.
columns
The width of the region.
rows
The height of the region.
Returns an ImagickPixelIterator for an image section.
错误时抛出 ImagickException。