我想在灰色阴影图像上重叠包含一些白点的黑色图像。我想让这个黑色图像透明。我使用了这里提到的 Java 代码。
但输出显示红色图像。为什么？
代码在这里提到：
public class OverlayImage{
public static void main(String[] args) {
File path = new File("/home/dmdd/Desktop/images"); // base path of the images
// load source images
BufferedImage image=null;
BufferedImage overlay=null;
try {
image = ImageIO.read(new File(path, "image.jpg"));
overlay = ImageIO.read(new File(path, "overlay.jpg"));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//overlay =(BufferedImage) makeImageTransparent(overlay,50);
OverlayImage over=new OverlayImage();
// create the new image, canvas size is the max. of both image sizes
int w = Math.max(image.getWidth(), overlay.getWidth());
int h = Math.max(image.getHeight(), overlay.getHeight());
//BufferedImage combined = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
Image overlay1=over.TransformGrayToTransparency(overlay);
BufferedImage combined=over.ApplyTransparency(image, overlay1);
try {
ImageIO.write(over.toBufferedImage(combined, w, h), "JPG", new File(path, "combined.jpg"));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private Image TransformGrayToTransparency(BufferedImage image)
{
ImageFilter filter = new RGBImageFilter()
{
public final int filterRGB(int x, int y, int rgb)
{
return (rgb << 8) & 0xFF000000;
}
};
ImageProducer ip = new FilteredImageSource(image.getSource(), filter);
return Toolkit.getDefaultToolkit().createImage(ip);
}
private BufferedImage ApplyTransparency(BufferedImage image, Image mask)
{
BufferedImage dest = new BufferedImage(
image.getWidth(), image.getHeight(),
BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = dest.createGraphics();
g2.drawImage(image, 0, 0, null);
AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.DST_IN, 1.0F);
g2.setComposite(ac);
g2.drawImage(mask, 0, 0, null);
g2.dispose();
return dest;
}
}
白点图像是：
黑色图像是：
叠加的红色图像是：
