(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_resolutionThe horizontal resolution.
y_resolutionThe 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