Java处理某些图片红色问题

问题现象：

Java上传图片时，对某些图片进行缩放、裁剪或者生成缩略图时会蒙上一层红色，经过检查只要经过ImageIO.read()方法读取后再保存，该图片便已经变成红图。因此，可以推测直接原因在于ImageIO.read()方法加载图片的过程存在问题。

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print ?

1. public static BufferedImage getImages(byte[] data) throws IOException {  
2.         ByteArrayInputStream input = new ByteArrayInputStream(data);  
3.         return ImageIO.read(input);  
4.     }  

public static BufferedImage getImages(byte[] data) throws IOException {
        ByteArrayInputStream input = new ByteArrayInputStream(data);
        return ImageIO.read(input);
    }

经过查阅得知ImageIO.read()方法读取图片时可能存在不正确处理图片ICC信息的问题，ICC为JPEG图片格式中的一种头部信息，导致渲染图片前景色时蒙上一层红色。

解决方案：

不再使用ImageIO.read()方法加载图片，而使用JDK中提供的Image src=Toolkit.getDefaultToolkit().getImage

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print ?

1. Image src=Toolkit.getDefaultToolkit().getImage(file.getPath());  
2. BufferedImage image=BufferedImageBuilder.toBufferedImage(src);//Image to BufferedImage  

Image src=Toolkit.getDefaultToolkit().getImage(file.getPath());
BufferedImage image=BufferedImageBuilder.toBufferedImage(src);//Image to BufferedImage

或者Toolkit.getDefaultToolkit().createImage

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print ?

1. Image imageTookit = Toolkit.getDefaultToolkit().createImage(bytes);  
2. BufferedImage cutImage = BufferedImageBuilder.toBufferedImage(imageTookit);  

Image imageTookit = Toolkit.getDefaultToolkit().createImage(bytes);
BufferedImage cutImage = BufferedImageBuilder.toBufferedImage(imageTookit);

BufferedImageBuilder源码：

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print ?

1. public static BufferedImage toBufferedImage(Image image) {  
2.         if (image instanceof BufferedImage) {  
3.             return (BufferedImage) image;  
4.         }  
5.         // This code ensures that all the pixels in the image are loaded  
6.         image = new ImageIcon(image).getImage();  
7.         BufferedImage bimage = null;  
8.         GraphicsEnvironment ge = GraphicsEnvironment  
9.                 .getLocalGraphicsEnvironment();  
10.         try {  
11.             int transparency = Transparency.OPAQUE;  
12.             GraphicsDevice gs = ge.getDefaultScreenDevice();  
13.             GraphicsConfiguration gc = gs.getDefaultConfiguration();  
14.             bimage = gc.createCompatibleImage(image.getWidth(null),  
15.                     image.getHeight(null), transparency);  
16.         } catch (HeadlessException e) {  
17.             // The system does not have a screen  
18.         }  
19.         if (bimage == null) {  
20.             // Create a buffered image using the default color model  
21.             int type = BufferedImage.TYPE_INT_RGB;  
22.             bimage = new BufferedImage(image.getWidth(null),  
23.                     image.getHeight(null), type);  
24.         }  
25.         // Copy image to buffered image  
26.         Graphics g = bimage.createGraphics();  
27.         // Paint the image onto the buffered image  
28.         g.drawImage(image, 0, 0, null);  
29.         g.dispose();  
30.         return bimage;  
31.     }  

public static BufferedImage toBufferedImage(Image image) {
        if (image instanceof BufferedImage) {
            return (BufferedImage) image;
        }
        // This code ensures that all the pixels in the image are loaded
        image = new ImageIcon(image).getImage();
        BufferedImage bimage = null;
        GraphicsEnvironment ge = GraphicsEnvironment
                .getLocalGraphicsEnvironment();
        try {
            int transparency = Transparency.OPAQUE;
            GraphicsDevice gs = ge.getDefaultScreenDevice();
            GraphicsConfiguration gc = gs.getDefaultConfiguration();
            bimage = gc.createCompatibleImage(image.getWidth(null),
                    image.getHeight(null), transparency);
        } catch (HeadlessException e) {
            // The system does not have a screen
        }
        if (bimage == null) {
            // Create a buffered image using the default color model
            int type = BufferedImage.TYPE_INT_RGB;
            bimage = new BufferedImage(image.getWidth(null),
                    image.getHeight(null), type);
        }
        // Copy image to buffered image
        Graphics g = bimage.createGraphics();
        // Paint the image onto the buffered image
        g.drawImage(image, 0, 0, null);
        g.dispose();
        return bimage;
    }