Short version again. HDR provides a different dynamic than our previous standards, with the goal of taking advantage of bright displays to expand the dynamic range of scenes. The result is usually more wow, more pop to the image.
4K false color image (from Hubble) of Saturn, Projected with HDR10. Stunning colors, lots of "pop!"
There are basically 3 HDR coding systems, a hardware solution from Dolby Labs (less widely adopted), the mainstream HDR10, which is the standard for Blu-ray UHD discs (4K movies), and most other things. Seems though, that streaming can have issues, so more recently another standard appeared and is also being found on most new models. That’s HLG, or Hybrid Log-Gamma. The RS440U and X590U support both major formats. Well done. Now let’s talk HDR and brightness.
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Problem: Most LCD TVs (including most being sold today) aren’t bright enough to meet the brightness standard HDR is looking for: 1000 NITS. (Wonder why you can look at LCD TVs and see a 4K UHD ones at 65” for $599, and another, same size, from the same brand for $2799? Those expensive ones are often 2-3 times as bright, so as to take full advantage of HDR.
Today’s projectors aren’t that bright. Roughly, most under $10,000 4K capable projectors with HDR, only have between 100 and 200 NITS. (It should be a logarithmic think so that’s 2-3 steps down in brightness.
As a result, projectors compromise, and each manufacturer seems to tackle those compromises differently. It’s not necessarily better, or worse, rather different, typically one projector has more pop, but overall seems a little darker, the other, more vibrant most of the time, but just doesn’t have as much wow, on those big wow type scenes.
As a result, when talking picture quality and in competition, I’ll subjectively tell you whether I think they have done a great implementation, or whether others may have done better. As usual, if you are buying your first projector, it’s most likely going to blow away your expectations.
Bottom Line is that the JVC RS440U and X590U support both HDR10 and HLG! They have you covered.
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