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, PECL imagick 3)
Imagick::setImageUnits — Sets the image units of resolution
Parameters
-
units -
Return Values
Returns true on success.
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User Contributed Notes 2 notes
euperia at gmail dot com ¶
12 years ago
salomonsanz at gmail dot com ¶
16 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
)
