Originally Posted by LumenChip
Interesting info; would you be sufficiently motivated to plot curves using a log scale for the ADL? This will likely reveal all the hidden data in the under 1% ADL.
I already have the data for 0% ADL (= ON/OFF) and 1% ADL, having measured these... I want to measure how the contrast tracks in-between. And I don't want to be estimating anything; I want it to be absolutely 100% accurate.
I am going to be measuring the full ADL range with respect to all of my projector reviews from here onwards.
For the benefit of those who are not in the know, ADL is defined as being the average on-screen brightness after gamma correction; and the ON/OFF contrast corresponds to an ADL of 0%, and the ANSI contrast corresponds to an ADL of 50%.
ON/OFF contrast and ANSI contrast are the two extremes of the contrast range that relates to video content. The ON/OFF Contrast only gives you the black level on a completely black picture. Similarly, the ANSI Contrast only gives you the black level at the extreme upper limit of video content brightness. Hence, typically over 99% of video content falls within these.
Consequently, in order to gain a proper understanding and to be able to properly assess and evaluate what is the comparative contrast and associated black levels performances regarding different display devices we really need to be taking measurements with respect to the contrast performance in-between the ON/OFF and ANSI contrast; namely the full range of ADL (Average Display Level) contrast.
Accurately measuring 0.1%, 0.2% and 0.5 % ADL provides the contrast performance with respect to the content coming out of and above full field black. And depending on the content there is quite the significant amount of content that falls within this range, so I consider it important to measure these further to ON/OFF and 1% ADL such that I can establish precisely what is the corresponding contrast performance between these and with respect to this range: