Originally Posted by Chad B
The MLL did indeed look that low with a totally black screen, but with content it did rise as seen in the calibration report data taken with 18% apl windows.
The before cal readings were due to some settings that were not factory default. I did measure pre cal movie mode after resetting it and it was more in line with what would be expected.
The high light output capability may be due to using black optimizer on Auto. That gives higher light output while retaining the low MLL.
Thanks for this info Chad! I just spent a little time running some tests and it does indeed look like Auto on black optimizer boosts peak luminance without compromising black level (see my measurements below).
Originally Posted by PlasmaPZ80U
Can anyone else see if black optimizer auto raises light output? If so, I might need to tweak my current calibration.
Yes it does! See my measurements below.
Originally Posted by LastButNotLeast
I'm not home to try it, but can't you just raise everything by increasing R, G & B equally in 2 point white balance gain? Alternatively, just increase 100% and 90% similarly?
As mentioned earlier, you end up hitting the limit of one or more of the RGB colors so in order to keep 100% white neutral you are still limited by the panel capability. The max luminance is ~ 35ftL for Movie mode and Dark Room setting for Black optimizer.
Okay, so I spent some time doing some measurements on my PN60F5300 today with my Colormunki Display and HCFR. HCFR averages over several readings to measure black levels providing a very accurate black level reading that has been very consistent with my meter. I was mainly interested in looking at 2 things:
- Impact of APL on black level luminance. For this I used the ColorHCFR small and Large APL patterns on the AVSHD709 disc and compared against all black screen readings
- Impact of Black Optimizer set to Dark Room v/s Auto
Below is the raw data from my tests.
Full Black Screen
0% AVSHD709 ColorHCFR Small APL
0% AVSHD709 ColorHCFR Large APL
Black Optimizer Dark - 12% Window size
120.009136 cd/m2 (100% Gray - i.e White)
0.006947 cd/m2 (0% Gray)
Black Optimizer Auto - 12% Window size, 100% Gray (white)
144.127510 cd/m2 (100% Gray - i.e White)
0.007023 cd/m2 (0% Gray)
As you can see from the readings above, The small APL patterns do not exhibit an appreciable rise in black level. However, for the larger APL pattern, I do notice an increase of black level from ~0.002 ftL to ~ 0.005 ftL which is consistent with ChadB's measurements.
I was also thrilled to note that the Black Optimizer setting of Auto does infact boost peak luminance of 100% white to ~42ftL from 35 ftL
if BO is set to dark room. Moreover, this does not seem to degrade black level for all black scenes as both settings measured MLL of ~ 0.002 ftL.