用红色掩码创建的java缓冲图像

Question

我在阅读图像时遇到问题.如果我做以下事情

URL url = new URL("http://tctechcrunch2011.files.wordpress.com/2012/10/gmm.jpg");
ImageInputStream stream = ImageIO.createImageInputStream(url.openStream());
ImageReader reader = ImageIO.getImageReaders(stream).next();
reader.setInput(stream, true, true);
BufferedImage image = reader.read(0);

ByteArrayOutputStream bos = new ByteArrayOutputStream();
ImageWriter writer = ImageIO.getImageWritersByFormatName("JPEG").next();
ImageOutputStream ios = ImageIO.createImageOutputStream(bos);
writer.setOutput(ios);
IIOImage ioImage = new IIOImage(image, null, null);
writer.write(ioImage);
ios.close();
FileOutputStream fos = new FileOutputStream("badimage.jpeg");
fos.write(bos.toByteArray());
fos.close();

图像用红色调写.是否有一些选项需要设置才能正确读取此图像？

Answer 1

问题可能与ImageIO.read无法正确读取某些JPG图像有关.这是一个类似的错误(错误ID:4881314),可能仍然部分未解决.

作为替代方案,您可以尝试使用Toolkit.createImage它似乎正确处理指定的图像.例如:

import java.awt.Image;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.net.URL;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

class TestImage {
    public static void main(String args[]) {
        try {
            URL imageUrl = new URL(
                "http://tctechcrunch2011.files.wordpress.com/2012/10/gmm.jpg");
            BufferedImage ioImage = ImageIO.read(imageUrl);
            Image toolkitImage = Toolkit.getDefaultToolkit().createImage(
                    imageUrl);

            JPanel panel = new JPanel();
            panel.add(new JLabel(new ImageIcon(ioImage)));
            panel.add(new JLabel(new ImageIcon(toolkitImage)));

            JOptionPane.showMessageDialog(null, panel, "ImageIO vs Toolkit",
                    JOptionPane.INFORMATION_MESSAGE);

        } catch (Exception e) {
            JOptionPane.showMessageDialog(null, e.getMessage(), "Failure",
                    JOptionPane.ERROR_MESSAGE);
            e.printStackTrace();
        }
    }
}

结果如下: