Haha, that's a pile of Thiamine hydrochloride USP (Vitamin B1). I'm a Pharmacist.. make custom and bespoke vitamins. Anyhow, maybe the image you're working from is downsampled from the actual screenshot. I loaded the original screenshot into Photoshop and selected identical pixels on both sides. Samples #1 and #2 differ by 1 point in R and G and samples #3 & 4 differ by 1 point in G. I showed the comparisons to several people on my screen and on my phone, everyone said it looked different, left side more green, but I also don't know why the two halves of the images you posted look identical. It's a mystery, maybe it's not worth the time to get to the bottom of this.... ... View more

Thanks for the replies everyone. Obviously my understanding of color and monitor profiles and calibration needs brushing up. I also had an opportunity to test Lightroom on a different monitor connected to the same machine and it still shows a difference in the reference vs active views. Greener for the reference and more magenta for the active. Screenshot below. This is on a Dell P2415Q. It is however, using profiles created using DisplayCAL with a Spyder5, and created using the same settings as my laptop's built in display. So given the circumstances, is this issue due to Lightroom, my monitor's color profiles or my monitors? And how do I fix it so I can make reliable edits? Cheers. ... View more

Hey Per Berntsen, If you are seeing the difference on your monitor as well then how does that suggest it's definitely my monitor's uniformity? I took the screenshot using the built in windows 10 screen sketch feature, so any color values differences should be independent of my monitor's capability? It should, however, capture non-uniformity if output by windows, lightroom or my gpu? Or am I missing something? Cheers. ... View more

Good point! I'll raise it with Razer. Cheers. ... View more

Thanks Per Berntsen and WobertC for your input on this. I think it indeed is a uniformity problem, I made the image smaller and moved it to different locations on the screen and I can see the color shift. Never noticed it before till yesterday, i guess the large gray variations made it stand out. I wonder whether DisplayCAL has a feature to produce profiles that compensate for uniformity.....the display is an IGZO 4k on a Razer Blade 14. ... View more

Hi there, I came across the same problem today and I suspect LR is using different calibration profiles for each image. The Reference is more green and the Active is more magenta. Monitor is calibrated and profiles loaded with DisplayCAL profile loader in Windows 10.  When compared to single image view, the Reference image is more accurate and the Active image doesn't seem to be color managed as my screen naturally has a magenta shift prior to calibration. Do you know of a way to specify what profiles to load in LR for the reference and active views so they display accurately? ... View more