Originally Posted by darinp2
Of course not. At the start of this you seemed to be making a claim about what the display needed to do, or what we would perceive based on the image light levels themselves. Now you seem to be making your claim about the levels the eye perceives. We are on a projector forum discussing projector differences, so why do you think the CR levels perceived in the eye are what matter instead of whether the eye could tell a difference for a CR in the images themselves?
I never said I could and why are you claiming this is the problem? We don't have to get the actual light levels right to see a difference. If one image has 10000:1 and one 1 million:1 and a person could perceive that the 1 million:1 had darker black then they have seen beyond 10000:1 in the relevant images..
Never said what the display should do since I was speaking in terms of real world intrascene contrast at a given time.
I think they both matter, but...
Of course I don't think 1000:1 on/off or ANSI is the max a display should have because it affects the intrascene ramp.
It depends on the pupil's position to how much range we see and how much chemical response / retina burn (or whatever you want to call it) the eye is experiencing, so no I don't know at every given pupil diameter what is the range we see, but they do know that in science, it's not a mystery as was implied.
You can always introduce additional variables to invalidate any measurement, but the point is scientists have stated that in general terms, so you'd assume them being a scientist of the eyes, that they spoke of it at a normal pupil response with a somewhat reasonable level of light.
In an ANSI test pattern, you probably cannot see much more than 1000:1 measured contrast as long as the meter is actually picking it up and the image is taking up the entirety of your visual field of view. On this pattern that does not change. I never got into dynamic contrast ranges or native on/off, simply thinking in terms of peak white to full black without the image changing.
If you compared 2 ANSI test patterns in A/B, the brighter one might appear to have higher contrast, but your eyes would be seeing less contrast as the PUPIL response would be different. That is the point, tests by eye are too fallible and they lie constantly when it comes to contrast.
I also don't know all the surface area coverage limitations and the variations in all that, so yah there are variations, but what that means is like I said before, in a significant area coverage with any significant amount of brightness (according to opthamlogy), we can only generally see up to 1000:1.
The pupil's position and ever-changing response of course matters in how we see how contrast, since contrast is the difference between DARK and LIGHT (and it is constantly changing). So you cannot delineate dark and light differences accurately by eye other than some general differences.Edited by coderguy - 9/29/13 at 4:03pm