The Imagick class
PHP Manual

Imagick::setResolution

(PECL imagick 2.0.0)

Imagick::setResolution — Sets the image resolution

Description

bool Imagick::setResolution ( float $x_resolution , float $y_resolution )
Warning

This function is currently not documented; only its argument list is available.

Sets the image resolution.

Parameters

x_resolution

y_resolution

Return Values

Returns TRUE on success.

The Imagick class
PHP Manual