Imagick::getImageCompression

(PECL imagick 3 >= 3.3.0)

Imagick::getImageCompression — Gets the current image's compression type

说明

public Imagick::getImageCompression ( ) : int

Gets the current image's compression type.

参数

此函数没有参数。

返回值

Returns the compression constant

User Contributed Notes

Mondragon 16-Jul-2020 05:25


Example use:



$im = new Imagick("mypicture.jpg");

$ctype = $im->getImageCompression();

if($ctype == Imagick::COMPRESSION_ZIP) echo "PNG file!";

if($ctype == Imagick::COMPRESSION_JPEG) echo "JPG file!";

if($ctype == Imagick::COMPRESSION_LZW) echo "GIF file!";



All options:

COMPRESSION_UNDEFINED

COMPRESSION_NO

COMPRESSION_BZIP

COMPRESSION_FAX

COMPRESSION_GROUP4

COMPRESSION_JPEG

COMPRESSION_JPEG2000

COMPRESSION_LOSSLESSJPEG

COMPRESSION_LZW

COMPRESSION_RLE

COMPRESSION_ZIP

COMPRESSION_DXT1

COMPRESSION_DXT3

COMPRESSION_DXT5

COMPRESSION_ZIPS

COMPRESSION_PIZ

COMPRESSION_PXR24

COMPRESSION_B44

COMPRESSION_B44A

COMPRESSION_LZMA

COMPRESSION_JBIG1

COMPRESSION_JBIG2



The numbers for which those constants stand differ by version. So always use the constants.

alitrix at gmail dot com 20-Oct-2017 12:51


This function is added in version 3.3.0 and above

undoable at gmail dot com 03-Jul-2013 10:44


This function is undefined. You must use getImageCompressionQuality() instead.