如何在Java中让图片不模糊？

Question

我在我的应用程序中截取了一个表格，我想在应用程序的教程部分显示该截取。我不能让它显示而不模糊。我不知道是什么原因造成的。当我在Windows照片查看器中打开图片时，图片是好的，但在应用程序中它是模糊的。

在我的项目中，我所有的图片都存储在一个叫做图标的包中，它们不是图片的链接，而是实际的副本。

这是我的代码的一个最小工作示例。如果有什么东西调整了图片的大小，使它失去了质量，我怎么能防止呢？

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);
    }

}

这里是图片，从应用程序中截取的原始图片，你可以看到它看起来还不错，这是我希望它在应用程序中的外观和显示方式。

现在这里是通过教程屏幕中的代码显示的图像的剪报。它不那么简洁，实际上它看起来比显示的要差一些，因为剪报放大了它。狙击使它更容易阅读，但你仍然可以看到，它看起来不像其他的图片，它已经失去了一些质量，我不知道为什么或做什么。任何帮助和建议都会有很大的帮助！谢谢你。

Answer 1

把这个代码放在你导入图片的地方。

    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的评论是解决我问题的方法。在我的Windows设置中，我的缩放比例是125%。我把它改成了100%，我的图片质量有了很大的提高。看起来就像在照片浏览器中一样。