//图像的裁剪，缩放
CropImageFilter filter=new CropImageFilter(x,y,w,h);
ReplicateScaleFilter filter=new ReplicateScaleFilter(w/2,h/2);
AreaAveragingScaleFilter filter=new AreaAveragingScaleFilter(w/2,h/2);
FilteredImageSource fis=new FilteredImageSource(im.getSource(),filter);
im_des=createImage(fis);
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