8 Replies Latest reply on Mar 17, 2013 9:58 AM by JJMack

    Math behind Photoshop linear dodge (add) blending mode

    pbholmen

      Yes, I know this sounds like a stupid question, because all of the web is littered with answers to it, they say it simply adds the two components. But this is only correct if there is no transparency involved. Once there is transparency involved, it gets more complex. So, what is the math behind the linear dodge blending mode if the top layer has semi-transparent pixels (=alpha less than 1)?

       

      I only need the math for the resulting RGB values.