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>");
?>
Imagick::getCompression
(PECL imagick 2, PECL imagick 3)
Imagick::getCompression — Gets the object compression type
Parameters
This function has no parameters.
Return Values
Returns the compression constant
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User Contributed Notes 1 note
holdoffhunger at gmail dot com ¶
12 years ago
