Originally Posted by tgm1024
I'm still confused by "pixel gradients". Do you mean the color depth contouring or the ability to see the individual subs? An image gradient, or just gradient is usually about exposing how color/gray ramps look and what was done to mitigate the contouring from too low a bit depth.
4K does not solve the contouring issue, unless it's employing a scattering or dithering kind of approach in which case the dither itself is at a higher resolution and is less obvious. But even at 2K resolutions, that dithering is nearly impossible to discern anyway even with equipment because it's a dither of neighboring output levels.
Interesting about the dithering thing I have a 2013 40" Sony R4 in the bedroom I got the panel number outa
the service menu and looked it up at panelook it's a Samsung SPVA-2 ,6 bit + high frc panel on a 10 bit interface in 8 bit display overdrive mode . I was pissed thinking it wasn't any good almost sent it back till I figured it out !
I wasn't all that happy with the colors at the time till I figured out just use Cinema mode ,neut color and max out contrast and back light and go from there and then everything fell into line . This panel has .022 cd/m2 black and 4750:1 contrast and V.G. picture now little better and little brighter than 2014 W600B sets IMO. ofc that was in the store vs mine at home .
.Sony R4 can resolve 0-255 color also . I'll trade off 8 bit for 6 bit + high frc for better contrast and black levels if given the choice of having to choose one over the other.
Not knowing much (nothing at all ) about these (6 bit + high frc) things I read up on it and AFAIK
found out modern 6 bit high frc panels can do all of 8 bit color just fine with modern algorithms and fast dithering , grey scale and color gradients looked V.G. on AVS HD.709 test patterns also. On solids only slight
radial banding U can't see on program
back light uniformity is real decent also. only rub is Cyan is pushing a little blue nothing noticeable on pgm though .
don't know if it's the TV silicon or the panel .
At least for this set it worked out fine wouldent be surprised if Sony and others were doing the 6 bit + high frc thing a lot now in the 1080p sets with VA and maybe similar for *some 4K sets with Sammy or AUO VA panels .No clue if LGD even makes those .
FWIW here are some interesting Sony black /contrast comparison from Rtings.co.
5 Sony black level + contrast Comparison
2013 Sony R450A Black: 0.022 cd/m2 Contrast: 4750 : 1 Samsung SPVA
2014 Sony W600B Black: 0.026 cd/m2 Contrast: 3500 : 1 Samsing SPVA
2014 Sony W800B Black: 0.020 cd/m2 Contrast: 5260 : 1 AUO AMVA5
2014 Sony W850B Black: 0.026 cd/m2 Contrast: 4273 : probably AUO AMVA *panel mfr/type/spec may vary by size
2014 Sony W950B Black: 0.111 cd/m2 Contrast: 942 : 1 >>>>maybe LGD S- IPS