http://memojava.blogspot.com/2008/03/image.html

{{code Java,
BufferedImage changSize(BufferedImage image, int width, int height) {
    BufferedImage shrinkImage = new BufferedImage(width,height, image.getType());
    Graphics2D g2d = shrinkImage.createGraphics();
    g2d.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION,
    RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
    g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
    RenderingHints.VALUE_ANTIALIAS_ON);
    g2d.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING,
    RenderingHints.VALUE_COLOR_RENDER_QUALITY);
    g2d.setRenderingHint(RenderingHints.KEY_DITHERING,
    RenderingHints.VALUE_DITHER_ENABLE);
    g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
    RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
    g2d.setRenderingHint(RenderingHints.KEY_RENDERING,
    RenderingHints.VALUE_RENDER_QUALITY);
    g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
    RenderingHints.VALUE_INTERPOLATION_BILINEAR);
    g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS,
    RenderingHints.VALUE_FRACTIONALMETRICS_ON);
    g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL,
    RenderingHints.VALUE_STROKE_NORMALIZE);
    g2d.drawImage(image, 0, 0, width, height, null);
    return shrinkImage;
}
}}
全てのヒントを入れる必要はない。
画像に関しては
 RenderingHints.KEY_INTERPOLATION
を設定すれば、だいたいOK。
個人的には
 RenderingHints.VALUE_INTERPOLATION_BILINEAR
よりも
 RenderingHints.VALUE_INTERPOLATION_BICUBIC
のほうが好き。
{{category2 プログラミング言語,Java}}