Fauvist opened this issue on Feb 18, 2010 · 4 posts
Quest posted Fri, 19 February 2010 at 1:16 AM
I’m on a Windows XP based PC but I found your quarry of interest and decided to google for an answer hoping to help. In one article it explains that a big aperture setting takes an average of the color. A smaller aperture gives a more precise reading. Looking at your illustration it shows your aperture to be in the middle so I thought this might be a possibility.
Upon searching further I came across a second article which may be of interest to you. It explains an inherent problem between Photoshop’s color management system and the OS’s. Just thought I’d post them for your perusal. On the second site you may want to get right to the point so you could start reading after the 8th paragraph where it says: “Why is this so difficult?”