Originally Posted by tbaudoin
I have a few questions regarding:
1. with the probe covering all the screen. What is meant here? Using a "non-contact" probe? or?
2. if not, then are you moving back from the display to get the Ypeak? Or, if in contact, moving to the part that is the brightest or just trying to pin the 50% middle and match it to a pattern size that provides a similar reading?
going to give it a try, but thougt I needed to understand a little better so I don't chase ghost too much. Sounds like an interesting method. What are some others?
here are the steps in detail as i understood them:
(1) Establishing Full Screen Probe Distance
> put up 100% white patch FULL SCREEN, establish probe distance from screen so u read the entire screen, moving the probe back and forward (towards / away from the screen), once peak luma value drops you are too far from the screen
(2) Get Peak Luma Greyscale
> with the probe in the same established position from step 1, put up greyscale ramp FULL SCREEN and note the peak luma value the reading gives you
(3) Establish Pattern Size
> with the probe in the same established position from step 1, put up 100% white patch and change the patch size to match the peak luma value from step 2
(4) Establishing Probe Distance For Custom Pattern Size
> move the probe closer to the screen (closer to the patch size established in step 3) until you get a peak reading, that means the probe is just reading the patch itself, nothing around it
==> that will be the final position of the probe along with that patch size
I tried this out yesterday night and on my VT50 plasma and it did not work... the i1D3 I used as a colorimeter is so unstable in it's readings (maybe it is the VT50 plasma ABL causing issues here) that the values u read (peak luma) change constantly...
if I would leave the probe in one position for 1-5 minutes (just for testing), the peak luma value would continuously start to DROP although the plasma is constantly displaying a 100% white and the probe was not moved...
when u try to establish the position of the probe in (1) where you compare peak luma values, this probe behavior makes this impossible as you move the probe around comparing bogus values to each other...
If anybody else tests this, please let me know your findings...