Originally Posted by john stephens
First I'd like to chime in on the question of Contrast Ratio which seems to a new focus of discussion on that other LV thread. First it is important to note that as is usual, the calibration was performed with all the Bells and Whistles turned OFF. Owners will, hopefully, know that this TV includes something called:
DEEP FIELD IMAGER
This module dynamically enhances Black Levels in portions of the Screen to effectively increase Contrast and enhance Shadow Detail in select regions of the Scene.
Another thing to note is that the Brilliant Mode with all the Bells and Whistles turned ON and uncalibrated, of course, has much higher contrast than the calibrated Natural_Low Mode. So really, there are no concerns of lack ocontrast on this TV.
One can increase the contrast ratio by lowering the black level or increasing the light output, while keeping the other one constant. So, if the black level stays the same when you go from Natural to Brilliant, the contrast ratio would go up, since I suspect the light output would increase from the 45fL number UMR measured in the Natural setting. This is the reason why LCD's are so popular, their light output in the showroom is so blinding that most people don't notice the gray blacks.
While the ability to increase the light output is fine, as far as it goes, contrast ratio per se isn't the whole story. Overcoming an average black level, by increasing the light output, may result in a statistically acceptable contrast ratio, but you still end up with gray blacks.
In order to measure the contrast ratio UMR had to determine the black level. Would you mind disclosing it? If my math is correct the black level in the Natural Setting, at 45fL of light output, would be .0225