I went back yout your original lightened up image that you posted, and used the Microsoft magnifier program. I could see it pretty well when I set it for 8X magnification, and I DO see it in the lighter image. I could not make it out at all on the darker one. If I set the magnifier at 9X magnification, the image gets too pixelated to tell for sure if I am seeing something that is really there, or an artifact from the attempts of the computer to accurately display colors, but having to use adjacent pixels of color to approximate the correct one.
CyberPro