
Iniciado por
Manni
New parameters for Arve's tool and three new curves
As I said above, I've had the time to do a bit more testing with the wip branch of Arve's tool, which is another step above the master branch.
I have done some testing in low lamp, first because I wanted to same my life time, and also because I wanted to do without the fan noise, which can get annoying in high lamp at times as the PJ isn't far from my seat.
I get around 135nits at the moment in high lamp iris fully open. This should be closer to what many experience in high lamp. There is no difference between high lamp and low lamp, what matter is how much peak white you get.
I still prefer to use virtual brightness for peak white rather than actual brightness, which isn't relevant as you still need to play with reference white in that case.
The reason why I prefer to do so is because all the numbers are in the same frame of reference. In fact, when you use reference white to adjust brightness, the number is converted and shown as "effective", which proves that it's not the number kept for the calculations. Anyway, it's the same so use whichever makes more sense for you.
For my 135nits, I used a max brightness between 800 and 1000nits. I let Arve's tool calculate the soft start point, and instead of changing his default parameters I decided to raise my end slope parameter to 0.75, which achieves mostly the same result: staying close to PQ for longer, so that a curve resolving up to 4000nits can be used for 1100nits or less titles without too big a penalty on brightness/contrast.
People having less brightness simply need to lower the max brightness until the picture is bright enough, but they might also have to adjust end slope to not clip below 4000nits if they go below 600nits or so.
People with more brightness can increase max brightness up to 1200nits or so.
I use black brightness (only available in the wip branch) to solve my black crush issue. With BB set to 0.05, I resolve perfectly down to 0.5% with brightness and contrast at zero in both the JVC and the Panny.
YMMV, but it's much better to adjust things with the curve than with these controls.
If you have more black crush, try to raise bb (slowly).
If you don't have any, lower it back to zero.
Here are my parameters for my default curve:
max bright = 900
Ref white =100
soft clip start auto (375 if you use the master branch)
Hard clip 4000nits
Black brightness 0.05
set end slope 0.75
soft clip curve type: 0
Soft clip gamma: 1
For those using the master branch:
If I change the max bright to 1000 (my darker curve) soft clip starts at 415.
If I change the max bright to 800 (my brighter curve) soft clip starts at 335.
These three curves resolve 0.5 to 4000nits here and look very, very nice.
I'm going to play a bit with these curves playing different titles and I'll see how it goes.
I might create a "bump the low end" curve for titles mastered too dark, such as Arrival apparently, but with this curve I have no problem watching titles such as Star Trek Beyond or Batman vs Superman.
I watched Lucy with my 900 default curve above and it looks amazing, especially with the DI which works great.
I don't have Arrival yet, so if anyone else has a different title that seems "too dark" with one of the curves above and a peak white of 120-150nits, please let me know and I'll check it out.