I think it still matters, along with high resolution MTF and on/off CR. Off the screen is what ultimately matters, but projector values can help us determine those things. I also think ANSI CR being limited due to a reflection that shows up on some scenes with a small amount of white on black is worse that an overall washout effect, even at the same value.Darin, but do you still believe that ANSI contrast matters?
This depends on multiple things (like the geometry of content in the images), but I'll answer by providing an Excel spreadsheet (attached in a zip file) to do some back-of-the-napkin kinds of measurements. If somebody grabs that they can plug in their own numbers for ADL, gamma, brightest pixel in the image, etc. I started to work on making this spreadsheet more accurate since it breaks down at extremes at least, but for a general ballpark idea I think it can work.Here's a challenge to you. Two projectors are given, X and Y.
From Projector X's specifications:
Native contrast: 30000:1
ANSI contrast: 300:1
From Projector Y's specifications:
Native contrast: 15000:1
ANSI contrast: 600:1
Projector X's native contrast is 2 times higher than Y's but its ANSI contrast is 2 times lower. Guess what static contrast would be in scenes at 5%, 10% and 20% ADL? At which point the X projector will begin to lose and the Y will begin to win?
Assuming each has some white pixels this estimates the following for X and Y:
5%: X=2500:1, Y=5000:1
10%: X=1429:1, Y=2500:1
20%: X=714:1, Y=1429:1
They crossover with 1% at 10k:1 each by those calculations.
10.6 KB Views: 97