【IT168 技术文档】ImageMagick是用C/C++写的高性能图像分析处理软件。可以编辑、显示包括JPEG、TIFF、PNM、PNG、GIF和Photo CD在内的绝大多数当今最流行的图象格式。你可以改变图象尺寸、旋转、锐化、减少颜色或加入特殊效果到图象里，并且能够以另一种图象格式保存。

　　采用ImageMagick + JMagick API 或调用命令行编译及运行时需要用到附件的jmagick.jar

　　 安装JMagick生成的jar

　　环境在Linux下

　　附：

 /**
* 通过JMagick创建缩略图
*
* @param picFrom
*            来源图片
* @param picTo
*            目标图片
* @param width
*            宽
* @param height
*            高
*/
public static final void resizeWithXY(String picFrom, String picTo,
int width, int height) {
MagickImage image = null;
MagickImage scaled = null;
ImageInfo info = null;
try {
info = new ImageInfo(picFrom);
image = new MagickImage(info);
scaled = image.scaleImage(width, height);
scaled.setFileName(picTo);
scaled.writeImage(info);
} catch (MagickApiException ex) {
logger.error(ex + ": " + ex.getReason() + ", "
+ ex.getDescription());
} catch (MagickException ex) {
logger.error("MagickException: " + ex);
} finally {
image.destroyImages();
scaled.destroyImages();
image = null;
scaled = null;
info = null;
}
}
/**
* 通过最大值(宽或高)产生缩略图
*
* @param picFrom
*            来源图片
* @param picTo
*            目标图片
* @param maxSize
*            宽或高的最大值
*/
public static final void resizeWithMaxSize(String picFrom, String picTo,
int maxSize) {
MagickImage image = null;
MagickImage scaled = null;
ImageInfo info = null;
try {
info = new ImageInfo(picFrom);
image = new MagickImage(info);
float wScale = (float) maxSize / (float) image.getXResolution();
float hScale = (float) maxSize / (float) image.getYResolution();
// 计算缩放比例
            float scale = Math.min(wScale, hScale);
if ((double) scale > 1.0D)
scale = 1.0F;
wScale = scale;
hScale = scale;
// 产生缩略图
            scaled = image.scaleImage(
(int) ((float) image.getXResolution() * wScale),
(int) ((float) image.getYResolution() * hScale));
scaled.setFileName(picTo);
scaled.writeImage(info);
} catch (MagickApiException ex) {
logger.error(ex + ": " + ex.getReason() + ", "
+ ex.getDescription());
} catch (MagickException ex) {
logger.error("MagickException: " + ex);
} finally {
image.destroyImages();
scaled.destroyImages();
image = null;
scaled = null;
info = null;
}
}