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Imagick::getCompression

(PECL imagick 2, PECL imagick 3)

Imagick::getCompressionВозвращает тип сжатия объекта

Описание

public Imagick::getCompression(): int

Возвращает тип сжатия объекта.

Список параметров

У этой функции нет параметров.

Возвращаемые значения

Возвращает константу сжатия

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User Contributed Notes 1 note

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holdoffhunger at gmail dot com
12 years ago
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>");

?>
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