$image = new Imagick($url);
$image->blurImage($x, $y);
调用blurImage($x, $y)函数报错：
原因是：原来的图片是CMYK的是印刷模式的。改为RGB显示模式就好用了！
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*** glibc detected *** /data/php/bin/php: free(): invalid next size (fast): 0x00007f04340024b0 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x75e66)[0x7f044ae21e66]
/lib64/libc.so.6(+0x789b3)[0x7f044ae249b3]
/usr/local/lib/libMagickCore.so.2(RelinquishMagickMemory+0xf)[0x7f044125392f]
/usr/local/lib/libMagickCore.so.2(DestroyPixelCacheNexus+0x71)[0x7f04411c1761]
/usr/local/lib/libMagickCore.so.2(GetVirtualPixelsFromNexus+0x4d9)[0x7f04411c2349]
/usr/local/lib/libMagickCore.so.2(GetCacheViewVirtualPixels+0xba)[0x7f04411c735a]
/usr/local/lib/libMagickCore.so.2(+0x87ea1)[0x7f0441218ea1]
/usr/lib64/libgomp.so.1(+0xe0c5)[0x7f0440f8a0c5]
/lib64/libpthread.so.0(+0x79d1)[0x7f044a56a9d1]
/lib64/libc.so.6(clone+0x6d)[0x7f044ae948fd]
7f043e5d3000-7f043e5db000 r-xp 00000000 fd:00 12250 /usr/local/lib/ImageMagick-6.5.1/modules-Q16/coders/jpeg.so
7f043e5db000-7f043e7db000 ---p 00008000 fd:00 12250 /usr/local/lib/ImageMagick-6.5.1/modules-Q16/coders/jpeg.so
7f043e7db000-7f043e7dc000 rw-p 00008000 fd:00 12250 /usr/local/lib/ImageMagick-6.5.1/modules-Q16/coders/jpeg.so