java的缓冲图像用红色面具创建 [英] java buffered image created with red mask

问题描述

我有麻烦读取图像。如果我做了以下

I am having trouble reading an image. If I do the following

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();

的图像写入用红色色调。有一些需要设置为正确读取这一形象的选择吗？

the image is written with a red tint. Is there some option that needs to be set to read this image correctly?

推荐答案

可能与 ImageIO.read 的问题无法正确读取一些JPG图片。下面是一个类似 错误（错误号：4881314），这可能仍然是尚未解决的部分。

The problem maybe related to ImageIO.read that fails to correctly read some JPG images. Here is a similar bug (Bug ID: 4881314) that may still be partially unresolved.

作为一种替代方法，你可以尝试使用 Toolkit.createImage ，似乎正确处理指定的图像。例如：

As an alternative you can try using Toolkit.createImage that seems to handle the specified image correctly. For example:

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();
        }
    }
}

下面是结果：

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