Imagick::getImageResolution

(PECL imagick 2, PECL imagick 3)

Imagick::getImageResolution — 获取图像的x,y轴分辨率

说明

Imagick::getImageResolution ( ) : array

获取图像的x,y轴分辨率

返回值

返回分辨率值的数组

错误／异常

错误时抛出 ImagickException。

User Contributed Notes

christian at cvj dot se 20-Feb-2014 11:48


For me getImageResolution() always returns X and Y resolution in pixels per centimeter, no matter if I set it with setImageUnits() or not.



So an easy way to convert the result from pixels per centimeter to pixels per inch is to do this:



<?php

$resource = new Imagick($path);

$imageResolution = $resource->getImageResolution();



if (!empty($imageResolution['y'])) { 

$imageResolution['y'] = 

                            round($imageResolution['y'] * 2.54, 2);

}



if (!empty($imageResolution['x'])) {

$imageResolution['x'] = 

                            round($imageResolution['x'] * 2.54, 2);

}



?>

Alex 27-Sep-2013 10:00


Here is simple code snippet to get image DPI:

<?php

$img = new imagick( 'file.jpg' );

print_r($img->getImageResolution()); // Array ( [x] => 72 [y] => 72 )



?>

Simon Epskamp 20-Sep-2013 08:30


Please note that this method seems to return the image density, or DPI, not it's output resolution. If you want the output resolution, please refer to Imagick::getImageGeometry: http://www.php.net/manual/en/imagick.getimagegeometry.php



See http://www.imagemagick.org/Usage/basics/#density for more infomation on the difference.

Shawn Pyle 18-Apr-2011 12:53


As of the following versions, the results of this function returns the x and y resolution as floats.



desktop:~$ convert --version

Version: ImageMagick 6.6.9-1 2011-04-14 Q8 http://www.imagemagick.org

Copyright: Copyright (C) 1999-2011 ImageMagick Studio LLC

Features: OpenMP OpenCL 



desktop:~$ pecl list

Installed packages, channel pecl.php.net:

==========================

Package Version State

imagick 3.0.1   stable



desktop:~$ php --version

PHP 5.3.5 (cli) (built: Mar  1 2011 12:57:53) 

Copyright (c) 1997-2010 The PHP Group

Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies

    with Xdebug v2.1.0, Copyright (c) 2002-2010, by Derick Rethans

perching_eagle at yahoo dot com 04-Oct-2007 06:14


//location of image: c:/htdocs/rose.jpg

$path="c:/htdocs/";

$image=new Imagick($path."rose.jpg");

$array=$image->getImageResolution();

print_r($array);



result:

Array

(

    [x]=>75

    [y]=>75

)