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使用JMagick为图片打水印

Posted by eDWARD at 22:59

1. 为了保护图片的版权，我们经常需要在上传的照片上打上版权信息或图标，下面介绍利用JMagick在图片上做标记。引入JMagick需要的类库：

   import java.awt.Dimension;
   import java.awt.Rectangle;
   
   import magick.CompositeOperator;
   import magick.ImageInfo;
   import magick.MagickException;
   import magick.MagickImage;
   

2. 下面介绍如何使用JMagick做标记：

   public static void mask(String logoPath, String srcPathName, String destPathName, int location, int scale) throws MagickException {
     int width = getWidth(srcPathName);
     int height = getHeight(srcPathName);
     int x = 0, y = 0;
     int w, h;
     w = scale * 70 / 100;
     h = scale * 65 / 100;
     boolean lc = true;
     if (width < height) {
       switch (location) {
         case 0:
           lc = false;
           break;
         case 1:
           x = width / 4 - w;
           y = height / 8 - h / 2;
           break;
         case 2:
           x = width / 2 - w;
           y = height / 8 - h / 2;
           break;
         case 3:
           x = width * 3 / 4 - w;
           y = height / 8 - h / 2;
           break;
         case 4:
           x = width / 4 - w;
           y = height / 2 - h / 2;
           break;
         case 5:
           x = width / 2 - w;
           y = height / 2 - h / 2;
           break;
         case 6:
           x = width * 3 / 4 - w;
           y = height / 2 - h / 2;
           break;
         case 7:
           x = width / 4 - w;
           y = height * 7 / 8 - h / 2;
           break;
         case 8:
           x = width / 2 - w;
           y = height * 7 / 8 - h / 2;
           break;
         case 9:
           x = width * 3 / 4 - w;
           y = height * 7 / 8 - h / 2;
           break;
       }
     } else {
       switch (location) {
         case 0:
           lc = false;
           break;
         case 1:
           x = width / 7 - w;
           y = height / 6 - h / 2;
           break;
         case 2:
           x = width / 2 - w;
           y = height / 6 - h / 2;
           break;
         case 3:
           x = width * 6 / 7 - w;
           y = height / 6 - h / 2;
           break;
         case 4:
           x = width / 7 - w;
           y = height / 2 - h / 2;
           break;
         case 5:
           x = width / 2 - w;
           y = height / 2 - h / 2;
           break;
         case 6:
           x = width * 6 / 7 - w;
           y = height / 2 - h / 2;
           break;
         case 7:
           x = width / 7 - w;
           y = height * 5 / 6 - h / 2;
           break;
         case 8:
           x = width / 2 - w;
           y = height * 5 / 6 - h / 2;
           break;
         case 9:
           x = width * 6 / 7 - w;
           y = height * 5 / 6 - h / 2;
           break;
       }
     }
     if (x < 10) {
       x = 10;
     }
     if (x + w * 2 + 10 > width) {
       x = width - w * 2 - 10;
     }
     if (y < 10) {
       y = 10;
     }
     if (y + h + 10 > height) {
       y = height - h - 10;
     }
     if (lc) {
       ImageInfo info = new ImageInfo();
       MagickImage image = null;
       MagickImage mask = null;
       MagickImage dest = null;
       try {
         image = new MagickImage(new ImageInfo(srcPathName + “[0]“));
         mask = new MagickImage(new ImageInfo(logoPath));
         image.setFileName(destPathName);
         image.writeImage(info);
         dest = new MagickImage(new ImageInfo(destPathName));
         dest.compositeImage(CompositeOperator.AtopCompositeOp, mask, x, y);
         dest.setFileName(destPathName);
         dest.writeImage(info);
       } finally {
         if (image != null) {
           image.destroyImages();
         }
         if (mask != null) {
           mask.destroyImages();
         }
         if (dest != null) {
           dest.destroyImages();
         }
       }
     }
   }
   

   getWidth(String src) & getHeight(String src)

   public static int getWidth(String src) throws MagickException {
     MagickImage magImage = null;
     try {
       ImageInfo info = new ImageInfo(src + “[0]“);
       magImage = new MagickImage(info);
       Dimension imageDim = magImage.getDimension();
       return imageDim.width;
     } finally {
       if (magImage != null) {
         magImage.destroyImages();
       }
     }
   }
   
   public static int getHeight(String src) throws MagickException {
     MagickImage magImage = null;
     try {
       ImageInfo info = new ImageInfo(src + “[0]“);
       magImage = new MagickImage(info);
       Dimension imageDim = magImage.getDimension();
       return imageDim.height;
     } finally {
       if (magImage != null) {
         magImage.destroyImages();
       }
     }
   }
   

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