Java图像缩放提高质量？

Question

我目前正在使用以下代码缩放图像。

Image scaledImage = img.getScaledInstance( width, int height, Image.SCALE_SMOOTH);
BufferedImage imageBuff = new BufferedImage(width, scaledImage.getHeight(null), BufferedImage.TYPE_INT_RGB);
Graphics g = imageBuff.createGraphics();
g.drawImage(scaledImage, 0, 0, new Color(0, 0, 0), null);
g.dispose();
ImageIO.write(imageBuff, "jpg", newFile);

任何人都知道缩放图像并获得更好质量结果的更好方法，或者甚至可以帮助改进我当前的代码以获得更好质量的输出。

Answer 1

您可以使用 Affine Transorm

public static BufferedImage getScaledImage(BufferedImage image, int width, int height) throws IOException {
    int imageWidth  = image.getWidth();
    int imageHeight = image.getHeight();

    double scaleX = (double)width/imageWidth;
    double scaleY = (double)height/imageHeight;
    AffineTransform scaleTransform = AffineTransform.getScaleInstance(scaleX, scaleY);
    AffineTransformOp bilinearScaleOp = new AffineTransformOp(scaleTransform, AffineTransformOp.TYPE_BILINEAR);

    return bilinearScaleOp.filter(
        image,
        new BufferedImage(width, height, image.getType()));
}

也试试这个 Example .

也试试 java-image-scaling图书馆