Is there an equivalence of MapRGB for a BufferedImage in Java?

Question

I'm trying to color individual pixels in a BufferedImage (TYPE_INT_RGB) using setRGB(), but I'm not sure how to format the RGB values. I want the result as a single integer. Is there a method that will take three int values (red, green, blue) and return a correctly formatted integer for setRGB()?

Answer 1

new Color(red, green, blue).getRGB();

Answer 2

Assuming you have ints r, g, and b, you can do:

int pixel = (r << 16) | (g << 8) | b;

This is because pixels in a BufferedImage are 4-byte ints. The 4-bytes represent Alpha, Red, Green, and Blue, in that order. So, if you shift red left by two bytes and green left by one byte, then bitwise-or r, g, and b, you will get a valid pixel to use with setRGB().