Originally Posted by Phoenix_001
Sorry to step into this discussion but I can see where most of you are coming from.
From Randal's point of view, I too have seen TVs that don't react like the one in the video.
What the video shows can be very easily misinterpreted. When the adjustment was being made at 80, the video appears
to show that 60, 70, 90, etc. remain unaffected, but that is highly deceptive and not
the actual case at all. During that step, the pattern generator was displaying the 80% grey level, so the software can only update that single point on the graph since it has absolutely no idea what is happening to the other levels. The other points appear
to be unaffected, since they are still showing the pre-adjustment level. It's only after a complete scan is rerun, that you can see the actual effects the other levels.
The TV used in the video is fairly linear on the high end, so things more-or-less fall into place for 60, 70, 90, etc. 100 has a slightly higher error but that's reasonable compromise.
The TV does not have a very linear behaviour on the low end, and the errors at 10 actually increased after calibration (R went from 93% to 88%). That is the point I made in the previous post.