jaapv Posted February 23, 2014 Share #1 Posted February 23, 2014 (edited) Advertisement (gone after registration) Last Monday I got a Cornea and Lens replacement on one eye. It turns out that the “new” eye is at least 750 degrees Kelvin cooler than the other one. In fact it looks like the “old” one has a light yellow filter over it. And we all know it is impossible to correct for a colour filter on the lens. Which means, I think, that we must take this yellowing of our biological optical systems over time into account when postprocessing… Edited February 23, 2014 by jaapv 2 Quote Link to post Share on other sites More sharing options...
Advertisement Posted February 23, 2014 Posted February 23, 2014 Hi jaapv, Take a look here Colour balance and age.. I'm sure you'll find what you were looking for!
Jeff S Posted February 23, 2014 Share #2 Posted February 23, 2014 Well, if there really is a yellow filter effect on one eye, you might have a built-in way to preview scenes with your MM. More seriously, hope all is well with the procedure. Jeff Quote Link to post Share on other sites More sharing options...
jaapv Posted February 23, 2014 Author Share #3 Posted February 23, 2014 Oh the operation went superbly well, thank you. But it does explain imo why I came to rely on grey card and colour checker more and more over the last years. 2 Quote Link to post Share on other sites More sharing options...
wda Posted February 23, 2014 Share #4 Posted February 23, 2014 Thanks for sharing this serious news with us Jaapv. Your conclusion might be right. On the other hand I am convinced that we all have minute or even serious variations in our colour perception. That is the dominant reason for my regular use of a reliable grey card for neutralizing colour casts during my post processing. Hope the op works out well for you. 1 Quote Link to post Share on other sites More sharing options...
Paul J Posted February 23, 2014 Share #5 Posted February 23, 2014 (edited) I was only last night wondering how our sight changes with age, thinking how my very young children have a completely different sense of taste. I wonder how/if how the way we see tone and contrast changes too, how our perception of tone and colour changes with our life experience. I've always wondered if we see differently from other people too. Edited February 23, 2014 by Paul J Quote Link to post Share on other sites More sharing options...
Paul J Posted February 23, 2014 Share #6 Posted February 23, 2014 In terms of post processing however, I would imagine it would just be relative. The change would be so gradual and, I would imagine uniform, that you wouldn't notice it so I don't think there shouldn't be a difference in that regard. Quote Link to post Share on other sites More sharing options...
jaapv Posted February 23, 2014 Author Share #7 Posted February 23, 2014 Advertisement (gone after registration) The problem being that, as I noticed, it is not just the colour temperature that is affected but the complete colour balance. I once tried to match a couple of shots with and without yellow filter - virtually impossible, and this seems to be what happens to our eyes now that I have the opportunity to compare forty years difference between them. 1 Quote Link to post Share on other sites More sharing options...
Jeff S Posted February 23, 2014 Share #8 Posted February 23, 2014 Just one more reason to dismiss much about forum postings that attempt to illustrate camera color issues. Between differences relating to screens, calibration and individual perception, let alone issues pertaining to initial lighting conditions and subject matter…oh, and personal taste...it's silly to expect any kind of reliable consensus. Jeff Quote Link to post Share on other sites More sharing options...
jaapv Posted February 23, 2014 Author Share #9 Posted February 23, 2014 Well, it might be summarized as “ we like what we like when we see it” Quote Link to post Share on other sites More sharing options...
Jeff S Posted February 23, 2014 Share #10 Posted February 23, 2014 Indeed. But you never know if two screens are showing the same thing, irrespective of the viewer's perception and taste. Jeff Quote Link to post Share on other sites More sharing options...
Paul J Posted February 23, 2014 Share #11 Posted February 23, 2014 I get what you mean - I stop editing when I it looks right. Hard to stop when you can never get it to look right, let alone if it is right! Answer = Monochrom Quote Link to post Share on other sites More sharing options...
jaapv Posted February 23, 2014 Author Share #12 Posted February 23, 2014 Just shot it today - but for colour for me - just close right eye Quote Link to post Share on other sites More sharing options...
mjh Posted February 23, 2014 Share #13 Posted February 23, 2014 My left eye has always been seeing warmer colours than my right eye – as far as I know, eyes are rarely in sync in this respect. Quote Link to post Share on other sites More sharing options...
jaapv Posted February 23, 2014 Author Share #14 Posted February 23, 2014 Normally the copy of photoshop everybody carries about in their brain equalizes left and right, it certainly does for me Quote Link to post Share on other sites More sharing options...
mjh Posted February 23, 2014 Share #15 Posted February 23, 2014 Normally the copy of photoshop everybody carries about in their brain equalizes left and right, it certainly does for me Yep, that’ why we normally don’t notice. Only when we compare how our left and right eye see the world do we start to wonder what’s the real colour of anything. Quote Link to post Share on other sites More sharing options...
jaapv Posted February 24, 2014 Author Share #16 Posted February 24, 2014 Yes, but when you get the hardware of a forty years younger eye implanted, the effect of aging gets very noticeable. Quote Link to post Share on other sites More sharing options...
AlanG Posted February 24, 2014 Share #17 Posted February 24, 2014 (edited) I just want to point out that Kelvin temperature variations are logarithmic and not a way to indicate a filter. So a 750 degree Kelvin change in daylight might be equivalent to around a 250 degree Kelvin change in tungsten light. Mired values are a common way to label color filter values. I am not sure what is going on in your eyes (perhaps there are contrast and saturation issues also) but our brain of course compensates for color variation due to color temperature of the light and other factors. The brain provides us with an interpreted image of how we "expect" to see things and our eyes our just one part of the system. So our eyes are generally poor tools for judging color other than by direct comparisons. And a direct comparison between your two eyes is what you are now doing. Edited February 24, 2014 by AlanG Quote Link to post Share on other sites More sharing options...
jaapv Posted February 24, 2014 Author Share #18 Posted February 24, 2014 Thanks. Exactly my point Quote Link to post Share on other sites More sharing options...
algrove Posted February 24, 2014 Share #19 Posted February 24, 2014 Jaap My understanding is that when cataract operations are necessary it is often the crystaline lens that over the years turns yellow or foggy which then necessitates an operation. Often people opt for a Uva filter in the new lens that can play havoc with color perception for us. Quote Link to post Share on other sites More sharing options...
jaapv Posted February 24, 2014 Author Share #20 Posted February 24, 2014 Yep. It was not a cataract operation, but the removal of a long-standing herpes leasion. Quote Link to post Share on other sites More sharing options...
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