1 创建一个图片,并且写入文件
BufferedImage grayImage = new BufferedImage(512, 512, BufferedImage.TYPE_INT_ARGB);
ImageIO.write(grayImage, "jpg", new File("I:\\a.jpg"));
2 读取一个图片
BufferedImage src = ImageIO.read(new File("I:\\a.jpg"));
BufferedImage grayImage = new BufferedImage(512, 512, BufferedImage.TYPE_INT_ARGB);
ImageIO.write(grayImage, "jpg", new File("I:\\a.jpg"));
BufferedImage src = ImageIO.read(new File("I:\\a.jpg"));