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  • Imagick::getCompression()

    (PECL imagick 2.0.0)

    Gets the object compression type

    说明

    Imagick::getCompression(void): int

    Gets the object compression type.

    返回值

    Returns the compression constant

    The ImageMagick PHP function for getCompression returns an integer representing the value associated with the ImageMagick Compression constant. You'll get numbers from 0 to 13, each representing a different particular type of compression. If printed out, the ImageMagick constants for compression come out as...
    imagick::COMPRESSION_UNDEFINED  0
    imagick::COMPRESSION_NO  1
    imagick::COMPRESSION_BZIP  2
    imagick::COMPRESSION_DXT1  3
    imagick::COMPRESSION_DXT3  4
    imagick::COMPRESSION_DXT5  5
    imagick::COMPRESSION_FAX  6
    imagick::COMPRESSION_GROUP4  7
    imagick::COMPRESSION_JPEG  8
    imagick::COMPRESSION_JPEG2000  9
    imagick::COMPRESSION_LOSSLESSJPEG  10
    imagick::COMPRESSION_LZW  11
    imagick::COMPRESSION_RLE  12
    imagick::COMPRESSION_ZIP  13
    Every time I have used this, whether on a jpeg image, a png image, a gif image, or a bmp image, it has always returned '0' as a value. There's a good chance that this is simply a value that is set by means of get/set, as opposed to actually producing values for a given image.
    Some sample code :
    <?php
          // Author: holdoffhunger@gmail.com
      
        // Imagick Type
        // ---------------------------------------------
      $imagick_type = new Imagick();
      
        // Open File
        // ---------------------------------------------
        
      $file_to_grab = "image_workshop_directory/test.bmp";
      
      $file_handle_for_viewing_image_file = fopen($file_to_grab, 'a+');
      
        // Grab File
        // ---------------------------------------------
      $imagick_type->readImageFile($file_handle_for_viewing_image_file);
      
        // Get Quantum Range
        // ---------------------------------------------
        
      $imagick_type_compression = $imagick_type->getCompression();
      
        // Print Results
        // ---------------------------------------------
      print("<pre>");
      print($imagick_type_compression);
      print("</pre>");
    ?>