Imagick::setImageCompression

(PECL imagick 2.0.0)

Imagick::setImageCompression — Sets the image compression

Описание

bool Imagick::setImageCompression ( int $compression )

Список параметров

compression: One of the COMPRESSION constants

Возвращаемые значения

В случае успешной работы возвращает TRUE.

Ошибки

Вызывает ImagickException при ошибке.

Коментарии

Mar 28

Автор: snipes2083 [at] yahoo com


Above it says "One of the COMPRESSION constants" for the parameters.  For any of you that found this confusing, you can find a list of the constants here:



Predefined Constants

imagick.constants



As an example for working with a jpeg image:



<?php

    $image = 'jpeg_image.jpg';

    $comression_type = Imagick::COMPRESSION_JPEG;

    

    $im = new Imagick($image);

    $im->setImageCompression($compression_type);

?>



This class does not actually compress the images but rather sets the compression type that is going to be used.  



If you would like to see how to compress the image see:

Imagick::setImageCompressionQuality

2010-03-28 13:03:35

http://php5.kiev.ua/manual/ru/imagick.setimagecompression.html

Apr 19

Автор: jacob at fragdev dot com


On Ubuntu 18.04, these are the default compression methods used for the following common image formats:



PNG:  Imagick::COMPRESSION_ZIP

JPEG: Imagick::COMPRESSION_JPEG

GIF:  Imagick::COMPRESSION_LZW

2019-04-19 19:12:16

http://php5.kiev.ua/manual/ru/imagick.setimagecompression.html

Aug 09

Автор: xudongding


const COMPRESSION_UNDEFINED = 0;

const COMPRESSION_NO = 1;

const COMPRESSION_BZIP = 2;

const COMPRESSION_FAX = 6;

const COMPRESSION_GROUP4 = 7;

const COMPRESSION_JPEG = 8;

const COMPRESSION_JPEG2000 = 9;

const COMPRESSION_LOSSLESSJPEG = 10;

const COMPRESSION_LZW = 11;

const COMPRESSION_RLE = 12;

const COMPRESSION_ZIP = 13;

const COMPRESSION_DXT1 = 3;

const COMPRESSION_DXT3 = 4;

const COMPRESSION_DXT5 = 5;

const COMPRESSION_ZIPS = 14;

const COMPRESSION_PIZ = 15;

const COMPRESSION_PXR24 = 16;

const COMPRESSION_B44 = 17;

const COMPRESSION_B44A = 18;

const COMPRESSION_LZMA = 19;

const COMPRESSION_JBIG1 = 20;

const COMPRESSION_JBIG2 = 21;