回答編集履歴
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コード追記
test
CHANGED
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[http://qiita.com/tool-taro/items/1f414424b31a86e97446](http://qiita.com/tool-taro/items/1f414424b31a86e97446)
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ここの「コメント」のとこに書かれている方法ならどうでしょうか。標準ライブラリだけでそこそこきれいな縮小だそうですよ。速度とかはわかりませんが…
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```Java
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public static void scaleImage(File in, File out, double scale) throws IOException {
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BufferedImage org = ImageIO.read(in);
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ImageFilter filter = new AreaAveragingScaleFilter(
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(int)(org.getWidth() * scale), (int)(org.getHeight() * scale));
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ImageProducer p = new FilteredImageSource(org.getSource(), filter);
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java.awt.Image dstImage = Toolkit.getDefaultToolkit().createImage(p);
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BufferedImage dst = new BufferedImage(
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dstImage.getWidth(null), dstImage.getHeight(null), BufferedImage.TYPE_INT_RGB);
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Graphics2D g = dst.createGraphics();
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g.drawImage(dstImage, 0, 0, null);
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g.dispose();
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ImageIO.write(dst, "jpeg", out);
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}
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```
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