java生成二维码图片清晰度问题

[ql429029806]

我的程序生成的二维码图片很模糊，用二维码生成器生成的图片很清晰，请问如何设置图片的清晰度呢？
如图，两张清晰度差别甚大！
望高手不吝赐教！非常感谢！！！

部分源码：
/**
* 生成二维码(QRCode)图片的公共方法
* @param content 存储内容
* @param imgType 图片类型
* @param size 二维码尺寸
* @return
*/
private BufferedImage qRCodeCommon(String content, String imgType, int size) {
BufferedImage bufImg = null;
try {
Qrcode qrcodeHandler = new Qrcode();
// 设置二维码排错率，可选L(7%)、M(15%)、Q(25%)、H(30%)，排错率越高可存储的信息越少，但对二维码清晰度的要求越小
qrcodeHandler.setQrcodeErrorCorrect('M');
qrcodeHandler.setQrcodeEncodeMode('B');
// 设置设置二维码尺寸，取值范围1-40，值越大尺寸越大，可存储的信息越大
qrcodeHandler.setQrcodeVersion(size);
// 获得内容的字节数组，设置编码格式
byte[] contentBytes = content.getBytes("utf-8");
// 图片尺寸
int imgSize = 67 + 12 * (size - 1);
bufImg = new BufferedImage(imgSize, imgSize, BufferedImage.TYPE_INT_RGB);
Graphics2D gs = bufImg.createGraphics();
// 设置背景颜色
gs.setBackground(Color.WHITE);
gs.clearRect(0, 0, imgSize, imgSize);

// 设定图像颜色> BLACK
gs.setColor(Color.BLACK);
// 设置偏移量，不设置可能导致解析出错
int pixoff = 2;
// 输出内容> 二维码
if (contentBytes.length > 0 && contentBytes.length < 800) {
boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes);
for (int i = 0; i < codeOut.length; i++) {
for (int j = 0; j < codeOut.length; j++) {
if (codeOut[j][i]) {
gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3);
}
}
}
} else {
throw new Exception("QRCode content bytes length = " + contentBytes.length + " not in [0, 800].");
}
gs.dispose();
bufImg.flush();
} catch (Exception e) {
e.printStackTrace();
}
return bufImg;
}

[黑石课堂]

[Inhibitory]

最后需要对图像处理一下，让白的更白，黑的更黑，图片只有两种颜色，(0, 0, 0), (255, 255, 255)，没有任何其他中间颜色。Java有函数操作卷积算法，对图像进行处理，例如模糊，锐化，浮雕等。 这有个简单的处理图像的程序，可以参考一下：

package com.tur.demo;

import javax.swing.*;
import java.awt.*;
import java.awt.color.ColorSpace;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.*;
import java.io.IOException;

public class ImageFilterTest {
    private static ImageFilter imageFilter = new ImageFilter("/Users/Biao/Desktop/x.png");
    private static JLabel imageLabel = new JLabel();

    private static enum FilterType {
        ORIGINAL("Original Image"),
        GRAY("Gray Image"),
        BLUR("Blur Image"),
        SHARP("Sharp Image"),
        EMBOSS("Emboss Image");

        private String description;

        private FilterType(String description) {
            this.description = description;
        }

        @Override
        public String toString() {
            return description;
        }
    };

    public static JButton createImageFilterButton(final FilterType type) {
        JButton button = new JButton(type.toString());

        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                Image image = null;

                switch (type) {
                    case ORIGINAL:
                        image = imageFilter.getOriginalImage();
                        break;
                    case GRAY:
                        image = imageFilter.getGrayImage();
                        break;
                    case BLUR:
                        image = imageFilter.getBlurImage();
                        break;
                    case SHARP:
                        image = imageFilter.getSharpImage();
                        break;
                    case EMBOSS:
                        image = imageFilter.getEmbossImage();
                        break;
                    default:
                        image = imageFilter.getOriginalImage();
                        break;
                }

                imageLabel.setIcon(new ImageIcon(image));
            }
        });

        return button;
    }

    private static void createAndShowGui() throws IOException {
        JFrame frame = new JFrame("Image filter");

        imageLabel.setIcon(new ImageIcon(imageFilter.getOriginalImage()));
        frame.getContentPane().add(imageLabel, BorderLayout.CENTER);

        JPanel buttonsPanel = new JPanel(new GridLayout(2, 3));
        buttonsPanel.add(createImageFilterButton(FilterType.ORIGINAL));
        buttonsPanel.add(createImageFilterButton(FilterType.GRAY));
        buttonsPanel.add(createImageFilterButton(FilterType.BLUR));
        buttonsPanel.add(createImageFilterButton(FilterType.SHARP));
        buttonsPanel.add(createImageFilterButton(FilterType.EMBOSS));
        frame.getContentPane().add(buttonsPanel, BorderLayout.SOUTH);

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(500, 500);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    public static void main(String[] args) throws Exception {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    createAndShowGui();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });
    }
}

class ImageFilter {
    private BufferedImage bufImage;

    public ImageFilter(String imagePath) {
        bufImage = imageToBufferedImage(new ImageIcon(imagePath).getImage());
    }

    public BufferedImage getOriginalImage() {
        return bufImage;
    }

    public BufferedImage getSharpImage() {
        Kernel kernel = new Kernel(3, 3, new float[]{
                -1, -1, -1,
                -1, 9, -1,
                -1, -1, -1
        });

        BufferedImageOp op = new ConvolveOp(kernel);
        return op.filter(bufImage, null);
    }

    public BufferedImage getBlurImage() {
        Kernel kernel = new Kernel(3, 3, new float[]{
                1f / 9f, 1f / 9f, 1f / 9f,
                1f / 9f, 1f / 9f, 1f / 9f,
                1f / 9f, 1f / 9f, 1f / 9f
        });

        BufferedImageOp op = new ConvolveOp(kernel);
        return op.filter(bufImage, null);
    }

    public BufferedImage getGrayImage() {
        ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);
        ColorConvertOp op = new ColorConvertOp(cs, null);
        return op.filter(bufImage, null);
    }

    public BufferedImage getEmbossGrayImage() {
        Kernel kernel = new Kernel(3, 3, new float[]{
                -2, 0, 0,
                0, 1, 0,
                0, 0, 2
        });

        BufferedImageOp op = new ConvolveOp(kernel);
        return op.filter(bufImage, null);
    }

    public BufferedImage getEmbossImage() {
        Kernel kernel = new Kernel(3, 3, new float[]{
                0,  -1, 0,
                -1, 5, -1,
                0, -1,  0
        });

        BufferedImageOp op = new ConvolveOp(kernel);
        return op.filter(bufImage, null);
    }

    /**
     * Convert the image to an buffered image.
     * @param image An instance of the class Image
     * @return An instance of the class BufferedImage that is converted from an image.
     */
    public static BufferedImage imageToBufferedImage(Image image) {
        int width = image.getWidth(null);
        int height = image.getHeight(null);

        BufferedImage buf = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics g = buf.createGraphics();
        g.drawImage(image, 0, 0, width, height, null);
        g.dispose();

        return buf;
    }
}

[Hy-whylaughing]

上述代码用eclipse直接导入报错啊。 java.lang.ExceptionInInitializerError Caused by: java.lang.IllegalArgumentException: Width (-1) and height (-1) cannot be <= 0 at java.awt.image.DirectColorModel.createCompatibleWritableRaster(DirectColorModel.java:999) at java.awt.image.BufferedImage.<init>(BufferedImage.java:312) at com.tur.demo.ImageFilter.imageToBufferedImage(ImageFilterTest.java:173) at com.tur.demo.ImageFilter.<init>(ImageFilterTest.java:107) at com.tur.demo.ImageFilterTest.<clinit>(ImageFilterTest.java:13) 求解释

[cheqinzho]

楼主，解决了么，我也遇上你一样的问题，求解