I want to apply negative value of RGB into image.
R: -8
G: -89
B: -76
I know that the value of RGB is in between 0 to 255 but i want to apply minus value and set offset something like that but don't know how to do.
I am using following link for reference.
http://blog.swishzone.com/?p=9606
I am using
red value = (original red value * redMultiplier) + redOffset
green value = (original green value * greenMultiplier) + greenOffset
blue value = (original blue value * blueMultiplier) + blueOffset
But it not working as i want.
Found one solution for change image color using negative RGB values. Following is the method without affecting alpha of image.