BlankAsp461
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Why Sony's BRAVIA 65U8500 & 65U8600 incorrectly render 4K Ultra HD Blu‑Ray Dolby Vision HDR metadata, making colors washout
I've finally broken into a Sony 65U8500 and a newer 65U8600 on a brand‑new set. Both use the latest HDR‑TV OS but when I ripped a 4K Ultra HD BD (BD‑2000‑5.1 with Dolby Vision 10‑bit), the picture suddenly looks like a pastel postcard.
Two specific problems:
• 10‑bit HDR metadata is being capped to 8‑bit before tone‑mapping. The Dolby Vision “maxCLL”/“maxFALL” values get squashed, so the brightest spots fade to pure white and the dimmer sections look muddy.
• The “HDR‑10+” tone‑curves in the OS have a hard‑coded 8‑bit lookup table that overrides the actual 12‑bit luminance info stored in the 2020 HDR‑10+ payload. Even with “Show original content” switched off, the TV still applies its own curve, ending up with an over‑exposed, washed‑out image.
I compared this to a Panasonic GZ2000 running the same disc: the color fidelity is on point, the LUTs honor the 12‑bit precision, and the peak brightness matches the file’s spec. Sony’s current firmware, v1.39.8.0 (latest at time of posting), doesn’t respect these nuances.
Bottom line for anyone with a BRAVIA 65U8500 or 65U8600: If you’re serious about HDR on 4K Blu‑Ray, you either have to roll back to OS 1.38.0 or, better still, opt for a different brand.
Thoughts on firmware updates? Any home‑brew fix or driver tweak to force true 10‑bit output? Would love to hear if anyone else’s experience matches mine.