Projector Screen Image Properties - Color Accuracy
Following the same procedure above, we measured the grayscale balance at 100 IRE directly from the projector - measuring R, G, and B, values. We then performed the same measurements with light reflected off of the screen. Below you can see two images of my calibration software. The first is the RGB balance measured directly off of the projector, the second reflected off of the screen.
From an overall color temperature change, the direct temperature measured 6654K and reflected off of the screen, 6456K, about a 200K difference, which is very slight and easy to correct for. Essentially this Elite screen reflects back just the slightest more red, than blue. The percentage measurements between Red and Blue, go from 99.62 (red) and 101.19 (blue) on the direct measurement off of the projector. Off of the screen, red increases slightly to 100.17 while Blue drops to 99.69.
Better still, the amount of green compared to Red and Blue remains virtually unchanged. dropping from 99.99% to 99.98%
In summary, this Elite screen would have to be
considered very color neutral, with the shift to red being barely detectable to the eye, even if you could show the same image with a perfect neutral screen, and then switch back to view the Elite screen.
The two images below (if you can read the small print - show (first) the color balance measuring directly off of the Optoma HD7100 projector. (You can see the RGB percentages on the right, and the target slightly off from a perfect 6500K, in the lower area. The second image shows the numbers and target, with light measured reflected off of the screen.