简介
GraphicsMagick号称图像处理领域的瑞士军刀。 短小精悍的代码却提供了一个鲁棒、高效的工具和库集合,来处理图像的读取、写入和操作,支持超过88种图像格式,包括重要的DPX、GIF、JPEG、JPEG-2000、PNG、PDF、PNM和TIFF。
通过使用OpenMP可是利用多线程进行图片处理,增强了通过扩展CPU提高处理能力。GraphicsMagick可以再绝大多数的平台上使用,Linux、Mac、Windows都没有问题。
GraphicsMagick支持大图片的处理,并且已经做过GB级别的图像处理实验。GraphicsMagick能够动态的生成图片,特别适用于互联网的应用。可以用来处理调整尺寸、旋转、加亮、颜色调整、增加特效等方面。GaphicsMagick不仅支持命令行的模式,同时也支持C、C++、Perl、PHP、Tcl、Ruby等的调用。事实上,GraphicsMagick是从 ImageMagick 5.5.2 分支出来的,但是现在他变得更稳定和优秀。
安装
- tar -xvf GraphicsMagick-1.3.12.tar
- ./configure --without-prel --enable-shared --disable-openmp
- make
- make install
示例:GraphicsMagick+im4java压缩图片
/**
* 先缩放,后居中切割图片
* @param srcPath 源图路径
* @param desPath 目标图保存路径
* @param rectw 待切割在宽度
* @param recth 待切割在高度
* @throws IM4JavaException
* @throws InterruptedException
* @throws IOException
*/
public static void cropImageCenter(String srcPath, String desPath, int rectw, int recth) throws IOException, InterruptedException, IM4JavaException{
IMOperation op = new IMOperation();
op.addImage();
op.resize(rectw, recth, '^').gravity("center").extent(rectw, recth);
op.addImage();
ConvertCmd convert = new ConvertCmd(true);
convert.run(op, srcPath, desPath);
}
问题
如果是windows环境安装则需要设置path环境配置,如D:\Program Files\GraphicsMagick-1.3.12-Q16;(此为GraphicsMagick的安装目录),各种版本官网下载
报错信息“
gm convert: No decode delegate for this image format (abc.jpg)”系图片库缺失所致
引用
http://qing.weibo.com/1838939461/6d9bfd4533000j33.html
./configure结果
GraphicsMagick is configured as follows. Please verify that this
configuration matches your expectations.
Host system type : x86_64-unknown-linux-gnu
Build system type : x86_64-unknown-linux-gnu
Option Configure option Configured value
-----------------------------------------------------------------
Shared libraries --enable-shared=no no
Static libraries --enable-static=yes yes
GNU ld --with-gnu-ld=yes yes
Quantum depth --with-quantum-depth=8 8
Delegate Configuration:
BZLIB --with-bzlib=yes no
DPS --with-dps=yes no
FlashPIX --with-fpx=no no
FreeType 2.0 --with-ttf=yes no
Ghostscript None gs (unknown)
Ghostscript fonts --with-gs-font-dir=default none
Ghostscript lib --with-gslib=no no
JBIG --with-jbig=yes no
JPEG v1 --with-jpeg=yes no
(需安装 jpeg delegate library)
JPEG-2000 --with-jp2=yes no
LCMS --with-lcms=yes no
Magick++ --with-magick-plus-plus=yes yes
PERL --with-perl=no no
PNG --with-png=yes no
(需安装 png delegate library)
TIFF --with-tiff=yes no
TRIO --with-trio=yes no
Windows fonts --with-windows-font-dir= none
WMF --with-wmf=yes no
X11 --with-x= no
XML --with-xml=yes no
ZLIB --with-zlib=yes yes
make
sudo make install
Delegate Library安装
JPEG delegate library
> gm convert 470f1bb8c5a98.jpg -resize 100x100 out.jpg
gm convert: No decode delegate for this image format (470f1bb8c5a98.jpg).
官方建议:This exception indicates that an external delegate library or its headers were not available when ImageMagick was built. To add support for the image format, download and install the requisite delegate library and its header files and reconfigure, rebuild, and reinstall ImageMagick. As an example, lets add support for the JPEG image format. First we install the JPEG RPMS:
原因是没有安装jpeg的包,这个可以在之前configure的结果中看出来,此时GraphicsMagick需要重新configure及build。
1)在GraphicsMagick官方网站提供的delegates下载页面中找到jpeg的包:libjpeg-6b.tar.gz。
2)安装jpeg delegate library: ./configure -> make -> sudo make install
3)重新安装GraphicsMagick (configure时会发现jpeg已安装)
不重装会报错:
org.im4java.core.CommandException: java.io.IOException: Cannot run program "gm": java.io.IOException: error=2, No such file or directory
PNG delegate library
gm convert: No decode delegate for this image format (ben3.png).
1)在sourceforge下载libpng-1.4.7.tar.gz (libpng-1.5.2.tar.gz 版本装上后,GraphicsMagick 在make时会报一个‘去引用’的错,原因未知)
2)安装png delegate library:./configure -> make -> sudo make install
3)重新安装GraphicsMagick (configure时会发现png已安装)
注: 由于之前安装过一次libpng-1.5.2,rm /usr/local/lib/libpng*,在重新安装了1.4.7后,仍有错误:gm: error while loading shared libraries: libpng14.so.14: cannot open shared object file: No such file or directory.
运行sudo ldconfig进行自动清理。
资料
IM4JAVA+GraphicsMagick处理网站图片:
http://javantsky.iteye.com/blog/747807
关于GraphicsMagick+im4java的研究心得:
http://yunduxiaocheng-gmail-com.iteye.com/blog/919457
GraphicsMagick+im4java图片处理方法:
http://www.beiqiu.com/article/106.html
GraphicsMagick官网:
http://www.graphicsmagick.org/index.html
GraphicsMagick官网delegates下载页面:
ftp://ftp.graphicsmagick.org/pub/GraphicsMagick/delegates/