(PECL imagick 2, PECL imagick 3)
Imagick::setResolution — Sets the image resolution
public Imagick::setResolution ( float $x_resolution , float $y_resolution ) : bool
Sets the image resolution.
x_resolution
The horizontal resolution.
y_resolution
The vertical resolution.
Returns true on success.
Imagick::setResolution() must be called before loading or creating an image.
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https://www.php.net/manual/en/imagick.setresolution.php