(PECL imagick 2, PECL imagick 3)
Imagick::setResolution — Sets the image resolution
$x_resolution, float $y_resolution): boolSets the image resolution.
x_resolutionThe horizontal resolution.
y_resolutionThe vertical resolution.
成功時(shí)返回 true。
Imagick::setResolution() must be called before loading or creating an image.