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，原因乃是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。
- public static BufferedImage getImages(byte[] data) throws IOException {
- ByteArrayInputStream input = new ByteArrayInputStream(data);
- return ImageIO.read(input);
- }
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
- Image src=Toolkit.getDefaultToolkit().getImage(file.getPath());
- BufferedImage image=BufferedImageBuilder.toBufferedImage(src);//Image to BufferedImage
或者Toolkit.getDefaultToolkit().createImage
- Image imageTookit = Toolkit.getDefaultToolkit().createImage(bytes);
- BufferedImage cutImage = BufferedImageBuilder.toBufferedImage(imageTookit);
BufferedImageBuilder源码：
- 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;
- }
