Java 处理上传的图片,使用ImageIO.read()读取后可能使图片覆盖一层红色的蒙版,问题如下:
QQ图片20180724145140.jpg原因是ImageIO.read()方法不能正确处理图片ICC信息,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。
源代码:
BufferedImage originalImage = ImageIO.read(upload);
修改后的代码:
Image src = Toolkit.getDefaultToolkit().getImage(upload.getPath());
BufferedImage originalImage = toBufferedImage(src);//Image to BufferedImage
其中 toBufferedImage() 方法定义如下:
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;
}
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