Originally Posted by rickardl
I found this article about contrast, "The Contrast Ratio Game " which mentions:at any given instant, the eye can possibly see over a range of 400 to 800:1 in contrast detection
...Do not get carried away with big contrast numbers - the eye dynamic response is the limiting factor.
Similarly important is the fact that the presence of even a minimal amount of ambient light would make a home theater projector with a high contrast ratio rating behave the same as one with a much lower rating.
...you need to view the image in a completely darkened room to be able to perceive the marginal difference between a 2000:1 and a 500:1 contrast ratio.
That article is completely wrong. Stunningly wrong. Amazingly wrong.
The claim of a max of 400:1 to 800:1 has no citation whatsoever, and once again ignorantly conflates the maximum range of contrast that the eye can see across a single scene with the Contrast Sensitivity Function, which is a measure of the exact opposite, which is how LITTLE a luminance delta the eye can see. It's no surprise that the rest of the article is equally misinformed or ill-informed, despite good intent.
Sad that this stuff still gets paraded around. They actually call a 2,000:1 contrast ratio a "high contrast ratio projector" which is silly.
The human eye in a single scene can see about 5 orders of magnitude(100,000:1), and way way more than that with time and movement of the eye.
I hate to be impatient with stuff like this that gets paraded around the forums, but we've been through this time and again.
Again I link to Darin's excellent contrast ratio article found here:http://www.hometheaterhifi.com/volum...06-part-1.html
The claims that the eye is a limiting factor is completely ridiculous and easily disproven with an easy test that ANYONE can test in their own theater. Put up a checkerboard pattern, and then stick your hand in the dark square: can you see a shadow on the screen? If yes, then you can definitely see well beyond the capability of the projector's ANSI contrast performance in your system.
That article is BS, pure and simple.