Java 如何让图片不模糊

Question

我在我的应用程序中截取了 table 的片段，我想在应用程序的教程部分显示该片段。我无法在不模糊的情况下显示它。我不知道是什么原因造成的。当我在 Windows 照片查看器中打开时，图片很好，但在应用程序中却很模糊。

我所有的图片都保存在我的项目中一个叫icons的包里，它们不是图片的链接，而是实际的拷贝。

这是我的代码的一个最小工作示例。如果有任何调整图像大小的东西导致图像质量下降，我该如何防止这种情况发生？

import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.Color;
import java.awt.Component;
import javax.swing.Box;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import java.awt.Insets;
import java.awt.Font;
import java.awt.Dimension;
import javax.swing.JTextArea;

@SuppressWarnings("serial")
public class example extends JFrame {

     private JPanel contentPane;

    public static void main(String[] args) {
         EventQueue.invokeLater(new Runnable() {
             public void run() {
                try {
                    example frame = new example();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    public example() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 558, 373);
        contentPane = new JPanel();
        contentPane.setBackground(Color.WHITE);
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        GridBagLayout gbl_contentPane = new GridBagLayout();
        gbl_contentPane.columnWidths = new int[]{0, 0};
        gbl_contentPane.rowHeights = new int[]{0, 0};
        gbl_contentPane.columnWeights = new double[]{1.0, Double.MIN_VALUE};
        gbl_contentPane.rowWeights = new double[]{1.0, Double.MIN_VALUE};
        contentPane.setLayout(gbl_contentPane);

        JPanel panel = new JPanel();
        panel.setBackground(Color.WHITE);
        GridBagConstraints gbc_panel = new GridBagConstraints();
        gbc_panel.fill = GridBagConstraints.BOTH;
        gbc_panel.gridx = 0;
        gbc_panel.gridy = 0;
        contentPane.add(panel, gbc_panel);
        GridBagLayout gbl_panel = new GridBagLayout();
        gbl_panel.columnWidths = new int[]{0, 0, 0};
        gbl_panel.rowHeights = new int[]{0, 0, 0, 100, 0};
        gbl_panel.columnWeights = new double[]{0.0, 1.0, Double.MIN_VALUE};
        gbl_panel.rowWeights = new double[]{0.0, 0.0, 0.0, 0.0, 
Double.MIN_VALUE};
        panel.setLayout(gbl_panel);

        JLabel lblWordsGoHere = new JLabel("Words go here");
        lblWordsGoHere.setFont(new Font("Tahoma", Font.PLAIN, 18));
        GridBagConstraints gbc_lblWordsGoHere = new GridBagConstraints();
        gbc_lblWordsGoHere.insets = new Insets(0, 0, 5, 0);
        gbc_lblWordsGoHere.gridx = 1;
        gbc_lblWordsGoHere.gridy = 0;
        panel.add(lblWordsGoHere, gbc_lblWordsGoHere);

        Component horizontalStrut = Box.createHorizontalStrut(20);
        horizontalStrut.setPreferredSize(new Dimension(20, 20));
        GridBagConstraints gbc_horizontalStrut = new GridBagConstraints();
        gbc_horizontalStrut.insets = new Insets(0, 0, 5, 5);
        gbc_horizontalStrut.gridx = 0;
        gbc_horizontalStrut.gridy = 1;
        panel.add(horizontalStrut, gbc_horizontalStrut);

        JLabel lblNewLabel = new JLabel("More words here...");
        lblNewLabel.setFont(new Font("Tahoma", Font.PLAIN, 14));
        GridBagConstraints gbc_lblNewLabel = new GridBagConstraints();
        gbc_lblNewLabel.insets = new Insets(0, 0, 5, 0);
        gbc_lblNewLabel.anchor = GridBagConstraints.WEST;
        gbc_lblNewLabel.gridx = 1;
        gbc_lblNewLabel.gridy = 1;
        panel.add(lblNewLabel, gbc_lblNewLabel);

        JLabel lblNewLabel_1 = new JLabel(new     ImageIcon(example.class.getResource("/icons/Step3.png")));
        GridBagConstraints gbc_lblNewLabel_1 = new GridBagConstraints();
        gbc_lblNewLabel_1.insets = new Insets(0, 0, 5, 0);
        gbc_lblNewLabel_1.gridx = 1;
        gbc_lblNewLabel_1.gridy = 2;
        panel.add(lblNewLabel_1, gbc_lblNewLabel_1);

        JTextArea txtrLotsOfDescriptive = new JTextArea();
        txtrLotsOfDescriptive.setFont(new Font("Monospaced", Font.PLAIN, 14));
        txtrLotsOfDescriptive.setText("lots of descriptive words....");
        GridBagConstraints gbc_txtrLotsOfDescriptive = new GridBagConstraints();
        gbc_txtrLotsOfDescriptive.fill = GridBagConstraints.BOTH;
        gbc_txtrLotsOfDescriptive.gridx = 1;
        gbc_txtrLotsOfDescriptive.gridy = 3;
        panel.add(txtrLotsOfDescriptive, gbc_txtrLotsOfDescriptive);
    }

}

这是图片，来自应用程序的原始截图，您可以看出它看起来不错，这就是我希望它在应用程序中的外观和显示方式。

现在这是通过教程屏幕中的代码显示的图像的片段。它没有那么简洁，实际上看起来比显示的要差一些，因为剪辑放大了它。截图使这里更容易阅读，但您仍然可以看到它看起来不像另一张图片。它失去了一些质量，我不知道为什么或该怎么做。任何帮助和建议都会大有帮助！谢谢！

Answer 1

将此代码放在导入图像的位置：

    Image image = null;
    try {
        image = ImageIO.read(new File("Images/image.png")).getScaledInstance(90, 90, Image.SCALE_SMOOTH);
    } catch (IOException e) {
        e.printStackTrace();
    }
    JLabel lblNewLabel_1 = new JLabel(new ImageIcon(image));

Answer 2

@camickr 的评论是我问题的答案。在我的 windows 设置中，我的缩放比例为 125%。我把它改成100%，我的画质大大提高了。看起来就像在照片查看器中一样。

Answer 3

我有同样的问题，我使用 java jdk-16.0.2 时图像像素化真正的问题出在 JDK，当我将 JDK 更改为 OpenJDK 时，所有图像都正确显示。您不必更改 windows 缩放比例，因为它会使一切变小。

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