如何更改Java缓冲图像的颜色

Question

I have a JavaBufferedImage. The foreground is Black and the background is transparent. I would like to recolor the image as Red.

I have read through other people's postings on this and tried using this code, but my Image winds up completey transparent when I run it.

Does anyone have any ideas? I am new to the Java 2D Image processing library. Thanks.

    imageIcon= new ImageIcon(getImageURL("/ImagesGun/GunBase.png"));
    gunBaseImage= Utilities.toBufferedImage(imageIcon.getImage());

    int red = 0x00ff0000;
    int green = 0x0000ff00;
    int blue = 0x000000ff;

    int width = gunBaseImage.getWidth();
    int height = gunBaseImage.getHeight();

    //Loop through the image and set the color to red
    for(int x = 0; x < width; x++){
        for(int y = 0; y < height; y++){
            long pixel = gunBaseImage.getRGB(x, y);
            if(pixel != 0){
                red = 0x00ff0000;

                gunBaseImage.setRGB(x,y,red);
            }

        }
    }

Answer 1

You are using a fully transparent value of red. The first entry in the color definition is the alpha value. If you want a fully opaque color you need to use ff as the first value. Therefore your red should be 0xffff0000, your green 0xff00ff00 and so on. This also means that black is ff000000.