I just started using the latest build, so I don't have a ton of impressions to share.
My question is about black and white clipping? Has anyone here had any luck using HDR10 test patterns?
I found a couple that seem to help, but I'd like to test again with a second display. The first pattern was a combined 8-bit/10-bit black clipping video that responded to both changes in target nits and gamma, although subtle in some cases. But it definitely seemed to help remove black crush on one display. 500 nits, for example, was crushing part of Bar 17 with a fixed gamma curve.
White clipping was more confusing. A 10-bit, 240-1000 nit clipping pattern produced different clipping depending on the target nits. A setting of 200 nits clipped early, while a setting of 1,000 nits didn't clip at all. I found a few values that clipped perfectly at 1,000 nits. Going to 4,000 nits, the ideal setting for 1,000 nits clipped at about 2,000 nits. A setting close to 4,000 nits didn't clip white at all. I see how desaturated colors become at higher nits, so the clipping might be expected.
I don't know what to make of this other than to assume 200 nits is overexposed for white (and not to mention flat), while 500 nits is crushing at least some of black. This would vary, of course, due to variability in calibrated gamma curves, a display's accuracy with a given gamma curve and the brightness of the display.
I have to say a big thanks for all of the effort madshi put into this
I am particularly impressed that you would put the final say into the most dedicated users.
HDR -> SDR is a niche feature is to some, but I can't see myself upgrading to a 4K display for a while and I've managed to get an image thus far that looks close to what I would expect from a PQ HDR image. It is hard to complain about that. The three 1,000 nits titles I looked at or watched seem to pass the tone mapping test easily. Only the couple of 4,000 nits titles I've seen left me with any questions about grading or color accuracy. Can't really say without slowly watching a few more movies. I won't have a large sample size to draw from like others here, so I don't know if I have any objections or not.