Wrong brightness converting image to grayscale in Java

Question

I\'m converting a image to gray scale in Java with the following code:

BufferedImage originalImage = ImageIO.read(new File(\"/home/david/input.bmp\"));
BufferedI         


        

Answer 1

Find out the conversion formula used by Gimp. It probably takes some human color perception into account, while the Java implementation is mathematical (R+G+B)/ 3.