Imagick::getImageProperties

(PECL imagick 2.0.0)

Imagick::getImageProperties — Returns the image properties

说明

array Imagick::getImageProperties ([ string $pattern = "*" [, bool $only_names = true ]] )

Returns all associated properties that match the pattern. If TRUE is passed as second parameter only the property names are returned. 此方法在Imagick基于ImageMagick 6.3.6以上版本编译时可用。

参数

pattern: The pattern for property names.
only_names: Whether to return only property names. If FALSE then also the values are returned

返回值

Returns an array containing the image properties or property names.

范例

Example #1 Using Imagick::getImageProperties() :

An example of extracting EXIF information.

  <?php

 
 $im  = new  imagick ( "/path/to/example.jpg" );

 
 $exifArray  =  $im -> getImageProperties ( "exif:*" );

 
 foreach ( $exifArray  as  $name  =>  $property )
{
    echo  " { $name }  =>  { $property } <br />\n" ; 
}

 ?>

用户评论:

[#1] benkuhl at gmail dot com [2013-01-24 18:40:26]

The output of this method on a PDF:

Array
        (
            [date:create] => 2013-01-24T13:27:37-05:00
            [date:modify] => 2013-01-24T13:27:37-05:00
            [pdf:HiResBoundingBox] => 1089x396+0+0
            [pdf:SpotColor-0] => PANTONE 697 C
            [pdf:SpotColor-1] => Black
            [pdf:SpotColor-10] => PANTONE 504 M C
            [pdf:SpotColor-2] => Strike_Thru
            [pdf:SpotColor-3] => PANTONE 7421 C
            [pdf:SpotColor-4] => PANTONE 697 C
            [pdf:SpotColor-5] => PANTONE 873 C
            [pdf:SpotColor-6] => PANTONE 504 M C
            [pdf:SpotColor-7] => Die
            [pdf:SpotColor-8] => PANTONE 697 C
            [pdf:SpotColor-9] => PANTONE 504 M C
            [pdf:Version] => PDF-1.5
            [signature] => 4d871b27b26537c523326f92454ecb2e19fa9e0e86e2a075f97354ad4f3bf122
        )

[#2] holdoffhunger at gmail dot com [2012-05-19 23:29:07]

The getImageProperties function in PHP returns an array of property keys available for an image.  To get these property values, you use getImageProperty function, giving it one of the available keys provided by the getImageProperties function result.  For some images, you may have a lot of properties and for some, you may have few.  The two that almost every image seems to have are "date:create" and "date:modify", but some images may have forty or more properties, some titled "exif:Compression", "photoshop:Credit", "jpeg:colorspace", "rdf:Alt", "stRef:documentID", and "xap:CreatorTool."  PNG files will also have properties like "png:IHDR.bit_depth" and "png:IHDR.width,height."  So far, it appears generally that GIF and BMP files, being simpler, have fewer properties, whereas JPEG and PNG files, being more complicated, have much wider array of properties.  It seems incredibly useful in document management.

And now, some sample code and results :

<?php             // Author: holdoffhunger@gmail.com              // Imagick Type         // ---------------------------------------------     $imagick_type = new Imagick();              // Open File         // ---------------------------------------------              $file_to_grab = "image_workshop_directory/test.png";          $file_handle_for_viewing_image_file = fopen($file_to_grab, 'a+');              // Grab File         // ---------------------------------------------     $imagick_type->readImageFile($file_handle_for_viewing_image_file);              // Get Image Properties         // ---------------------------------------------              $imagick_type_properties = $imagick_type->getImageProperties('*', FALSE);              // Print Image Properties         // ---------------------------------------------          print("<pre>");              print_r($imagick_type_properties);              // Print Each Individual, Image Property         // ---------------------------------------------          foreach($imagick_type_properties as $value)     {         print("$value --- ");         print($imagick_type->getImageProperty("$value"));         print("<br><br>");     }                      print("</pre>"); ?>

Results of this done on a standard PNG image :

Array
(
    [0] => date:create
    [1] => date:modify
    [2] => png:cHRM
    [3] => png:gAMA
    [4] => png:IHDR.bit_depth
    [5] => png:IHDR.color_type
    [6] => png:IHDR.interlace_method
    [7] => png:IHDR.width,height
    [8] => png:sRGB
)
date:create --- 2012-05-19T18:26:45-05:00

date:modify --- 2012-05-19T18:26:45-05:00

png:cHRM                  --- chunk was found (see Chromaticity, above)

png:gAMA                  --- gamma=0.45455 (See Gamma, above)

png:IHDR.bit_depth        --- 8

png:IHDR.color_type       --- 2

png:IHDR.interlace_method --- 0

png:IHDR.width,height     --- 320, 320

png:sRGB                  --- intent=0 (See Rendering intent)

[#3] www dot query at gmail dot com [2011-09-08 11:58:37]

To access a photograph's EXIF data an alternative method is the normal PHP Exif function.

<?php $exif_data = exif_read_data($pic1); $edate = $exif_data['DateTime']; ?>

See: http://php.net/manual/en/book.exif.php

[#4] mhufford [2009-08-03 14:03:55]

ImageMagick only supports setting a very small number of EXIF properties.

See http://www.imagemagick.org/discourse-server/viewtopic.php?t=14234