[java] Drawing: Omitting certain pixels

I cant help you with your problem, but why don't you just use gif or png?

Or perhaps this http://java.sun.com/javase/6/docs/api/java/awt/image/BufferedImage.html#getRGB(int,%20int) can help?

I think you'll have to test every pixel in the image, but if you don't have to many or to big images, it might be a possibility...

Quote:

Original post by Infinite_Daremo Ive tried looping through each pixel of a bmp and setting it to whatever the background clear colour is but that isn't going to help in the long run.

If you use BufferedImage with color type TYPE_INT_ARGB, and calls setRGB(x, y, 0). The current pixel should become transparent IIRC.

If your using the graphics class-

BufferedImage image = new BufferedImage(rw, rh, BufferedImage.TYPE_INT_ARGB);Graphics g2d = image.createGraphics();Color transparent = new Color(0, 0, 0, 0);g2d.setColor(transparent);

Something like that perhaps?

But seriously look into GIMP it's a free tool for image editing and it's pretty dang easy to make a transparent .gif or a transparent .png

You can simply render the image as you load it into your program. It only will work properly with gif and png, there are many little errors that can happen with jpeg formatting. But really all you need is a custom made function called

BufferedImage renderTransparent(BufferedImage image, int rgb){}

the code might look something like this,

....
....
ImageIcon img = new ImageIcon("/yourImage.png");
BufferedImage image = new BufferedImage(img.getIconWidth(), img.getIconHeight(), BufferedImage.TYPE_INT_ARGB);
Graphics2D g2D = image.getGraphics()
g2D.paintIcon(null, g2D, 0, 0); // Draws the image into the BufferedImage
g2D.dispose();

image = renderTransparent(image, 0xFFFF0000); // Will make all red pixels transparent.
....
....

public BufferedImage renderTransparent(BufferedImage image, int rgb){
for(int x = 0; x < image.getWidth(); x++){
for(int y = 0; y < image.getHeight(); y++){
if(image.getRGB(x, y) == rgb) // If the color matches the specified rgb
image.setRGB(x, y, 0); // Sets the pixel to transparent
}
}
return image;
}