You should use the PHP Imagick constants to correctly set the Image Units, as described here:
http://www.php.net/manual/en/imagick.constants.php
RESOLUTION constants
imagick::RESOLUTION_UNDEFINED (integer)
imagick::RESOLUTION_PIXELSPERINCH (integer)
imagick::RESOLUTION_PIXELSPERCENTIMETER (integer)
Imagick::setImageUnits
(PECL imagick 2.0.0)
Imagick::setImageUnits — Sets the image units of resolution
Description
Imagick::setImageUnits
( int
$units
) : boolSets the image units of resolution.
Parameters
-
units -
Return Values
Returns TRUE on success.
add a note
User Contributed Notes 2 notes
euperia at gmail dot com ¶
6 years ago
salomonsanz at gmail dot com ¶
10 years ago
$source = 'miphoto.jpg';
$imagick = new Imagick($source);
$imagick -> setImageUnits(2);
//0=undefined, 1=pixelsperInch, 2=PixelsPerCentimeter
$info = $imagick -> identifyImage();
print_r($info);
//ouput
/*
Array
(
[units] => PixelsPerCentimeter
)
