可运行的示例......

Question

我正在尝试读取图像，将其放大到80 * 60，然后通过复制方法将其复制大小。我的方法可以单独使用，但是当我在主方法中调用它们时，我的图像会变黑。有人可以帮我吗？这是我的代码：

import java.awt.BorderLayout;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class Test {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        BufferedImage Image = null;
        File fc = null;

          try{

              fc = new File("C:\\1.jpg");
              Image = ImageIO.read(fc);
              BufferedImage zoomin = new BufferedImage(ScaledImage(Image,80,60).getWidth(null),ScaledImage(Image,80,60).getWidth(null), BufferedImage.TYPE_BYTE_GRAY);
              JFrame frame = new JFrame("Scaled Resolution");
              frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
              JLabel lbl = new JLabel();
                lbl.setIcon(new  ImageIcon(ImgReplication(zoomin,2)));
                frame.getContentPane().add(lbl, BorderLayout.CENTER);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);

          }
          catch (Exception e1){
            System.out.println(e1);
            } 


    }
public static BufferedImage ImgReplication(BufferedImage image, int n) {

        int w = n * image.getWidth();
        int h = n * image.getHeight();

        BufferedImage enlargedImage =
                new BufferedImage(w, h, image.getType());

        for (int y=0; y < h; ++y)
            for (int x=0; x < w; ++x)
                enlargedImage.setRGB(x, y, image.getRGB(x/n, y/n));

        return enlargedImage;

    }
public static BufferedImage ScaledImage(Image img, int w , int h){

    BufferedImage resizedImage = new BufferedImage(w , h , BufferedImage.TYPE_BYTE_GRAY);
    Graphics2D g2 = resizedImage.createGraphics();
    g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
    g2.drawImage(img, 0, 0, w, h, null);
    g2.dispose();
    return resizedImage;
}


}

Answer 1

我建议的是：

    BufferedImage Image = null;
    File fc = null;

      try{

          fc = new File("C:\\1.jpg");
          Image = ImageIO.read(fc);
          BufferedImage sc=ScaledImage(Image,80,60);
          JFrame frame = new JFrame("Scaled Resolution");
          frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
          JLabel lbl = new JLabel();
            lbl.setIcon(new  ImageIcon(ImgReplication(sc,2)));
            frame.getContentPane().add(lbl, BorderLayout.CENTER);
            frame.pack();
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);

      }
      catch (Exception e1){
        System.out.println(e1);
        } 


}

public static BufferedImage ImgReplication(BufferedImage image, int n) {

    int w = n * image.getWidth();
    int h = n * image.getHeight();

    BufferedImage enlargedImage =
            new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);

    for (int y=0; y < h; ++y)
        for (int x=0; x < w; ++x)
            enlargedImage.setRGB(x, y, image.getRGB(x/n, y/n));

    return enlargedImage;

}

public static BufferedImage ScaledImage(Image img, int w , int h){

  BufferedImage resizedImage = new BufferedImage(w , h , BufferedImage.TYPE_INT_RGB);
  Graphics2D g2 = resizedImage.createGraphics();
  g2.drawImage(img, 0, 0, w, h, null);
  g2.dispose();
  return resizedImage;
}


}

Answer 2

所以，“核心”问题就在这里......

BufferedImage zoomin = new BufferedImage(
            ScaledImage(Image,80,60).getWidth(null),
            ScaledImage(Image,80,60).getWidth(null), 
            BufferedImage.TYPE_BYTE_GRAY);

所有这一切都是创建一个80x60的空白图像，并为实现它做了很多工作。

相反，你应该只使用像...这样的东西。

BufferedImage zoomin = ScaledImage(Image,80,60);

现在，如果你想让它成为灰度，那么你需要制作一个与BufferedImage图像大小相同的BufferedImage.TYPE_BYTE_GRAY类型的新zoomin图像并绘制zoomin图片给它......

您可能还想查看Quality of Image after resize very low -- Java和Java: maintaining aspect ratio of JPanel background image，了解有关缩放图像的更多想法。 get/setRGB效率不高，drawImage(x, y, w, h)的质量也不是那么好

可运行的示例......

因此，在进行建议修改后，我运行了您的算法，并提出了这个......

原创，ScaledImage，ImgReplication

import java.awt.EventQueue;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class Test {

    public static void main(String[] args) {
        new Test();
    }

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    try {
                        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                    } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                        ex.printStackTrace();
                    }

                    JFrame frame = new JFrame("Testing");
                    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                    frame.add(new TestPane());
                    frame.pack();
                    frame.setLocationRelativeTo(null);
                    frame.setVisible(true);
                } catch (IOException ex) {
                    ex.printStackTrace();;
                }
            }
        });
    }

    public class TestPane extends JPanel {

        public TestPane() throws IOException {
            BufferedImage master = ImageIO.read(new File("..."));
            setLayout(new GridBagLayout());

            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridwidth = GridBagConstraints.REMAINDER;

            add(new JLabel(new ImageIcon(master)), gbc);
            add(new JLabel(new ImageIcon(ScaledImage(master, 80, 60))), gbc);
            add(new JLabel(new ImageIcon(ImgReplication(master, 2))), gbc);
        }

    }

    public static BufferedImage ScaledImage(Image img, int w, int h) {

        BufferedImage resizedImage = new BufferedImage(w, h, BufferedImage.TYPE_BYTE_GRAY);
        Graphics2D g2 = resizedImage.createGraphics();
        g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        g2.drawImage(img, 0, 0, w, h, null);
        g2.dispose();
        return resizedImage;
    }

    public static BufferedImage ImgReplication(BufferedImage image, int n) {

        int w = n * image.getWidth();
        int h = n * image.getHeight();

        BufferedImage enlargedImage
                = new BufferedImage(w, h, image.getType());

        for (int y = 0; y < h; ++y) {
            for (int x = 0; x < w; ++x) {
                enlargedImage.setRGB(x, y, image.getRGB(x / n, y / n));
            }
        }

        return enlargedImage;

    }
}

所以它对我来说似乎没问题

通过Repication Method在java中缩放图像

2 个答案:

可运行的示例......