Swing/ColorConvertOp のバックアップの現在との差分(No.7)

サンプルコード

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Image img = icon1.getImage();
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BufferedImage source = new BufferedImage(
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    img.getWidth(this), img.getHeight(this), BufferedImage.TYPE_INT_ARGB);
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Graphics g = source.createGraphics();
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g.drawImage(img, 0, 0, this);
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g.dispose();
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#screenshot
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**サンプルコード [#a2a42159]
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#code{{
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 Image img = icon1.getImage();
 BufferedImage source = new BufferedImage(
     img.getWidth(this), img.getHeight(this),
     BufferedImage.TYPE_4BYTE_ABGR);
 Graphics g = source.createGraphics();
 g.drawImage(img, 0, 0, this);
 g.dispose();
 ColorConvertOp colorConvert = new ColorConvertOp(
     ColorSpace.getInstance(ColorSpace.CS_GRAY), null);
 BufferedImage destination = colorConvert.filter(source, null);
 icon2 = new ImageIcon(destination);
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ColorConvertOp colorConvert = new ColorConvertOp(
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    ColorSpace.getInstance(ColorSpace.CS_GRAY), null);
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BufferedImage destination = colorConvert.filter(source, null);
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icon2 = new ImageIcon(destination);
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• &jnlp;
• &jar;
• &zip;

• -

• 以下のようにGrayFilter.createDisabledImage(...)を使った場合よりきれいに変換可能

   icon2 = new ImageIcon(GrayFilter.createDisabledImage(img));
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  icon2 = new ImageIcon(GrayFilter.createDisabledImage(img));
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• GrayFilterの代わりに以下のようなRGBImageFilterを継承したフィルタを使う方法もある

   class MyGrayFilter extends RGBImageFilter {
     public MyGrayFilter() {
       canFilterIndexColorModel = true;
     }
     public int filterRGB(int x, int y, int rgb) {
       int a = (rgb >> 24) & 0xff;
       int r = (rgb >> 16) & 0xff;
       int g = (rgb >> 8) & 0xff;
       int b = rgb & 0xff;
       int m = Math.max(Math.max(r,g),b);
       return new Color(m,m,m,a).getRGB();
     }
   }
   
   FilteredImageSource fis = new FilteredImageSource(img.getSource(), new MyGrayFilter());
   icon2 = new ImageIcon(createImage(fis));
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  class MyGrayFilter extends RGBImageFilter {
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    public int filterRGB(int x, int y, int argb) {
      // int a = (argb >> 24) & 0xFF;
      int r = (argb >> 16) & 0xFF;
      int g = (argb >>  8) & 0xFF;
      int b = (argb      ) & 0xFF;
      // http://ofo.jp/osakana/cgtips/grayscale.phtml
      int m = (2 * r + 4 * g + b) / 7; //NTSC Coefficients
      return (argb & 0xFF_00_00_00) | (m << 16) | (m << 8) | m;
    }
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  }
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  // ...
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  ImageProducer ip = new FilteredImageSource(img.getSource(), new MyGrayFilter());
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  icon2 = new ImageIcon(Toolkit.getDefaultToolkit().createImage(ip));
  #spanend
  

• BufferedImage.TYPE_BYTE_GRAYでBufferedImageを作成して複写してもグレースケールに変換可能だが、透過色を使用している場合は注意が必要
  • 参考: Swing - Color to Grayscale to Binary

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