示例使用
$im = new Imagick("mypicture.jpg");
$ctype = $im->getImageCompression();
if($ctype == Imagick::COMPRESSION_ZIP) echo "PNG 文件！";
if($ctype == Imagick::COMPRESSION_JPEG) echo "JPG 文件！";
if($ctype == Imagick::COMPRESSION_LZW) echo "GIF 文件！";
所有选项
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
这些常量所代表的数字因版本而异。因此请始终使用常量。
