We intentionally clip incoming signals to the nominal peak, because not all gamma curves are well-defined outside the interval. HDMI standards are irrelevant here, unless you care about metadata passthrough (I don't).Īlso, BTW, do we support Superwhite of YCBCR when there is extra white things (more than 235 or 240)? Is there a standard to this? So, in this sense my code is more correct then, so is worth checking and comparing We are software, not hardware. Still, the colours are right and I don't see any shifts (except of lowering saturation) on several ColorChecker patterns. And contrary to other DV formats DVp5 carries no data about mastering display color space so TV can't decide where to compress and where just trim. One guess about why is that the data is assumed to cover BT2020 color space and the TV is more like P3. it is not ideal, I still miss a point on why encoded video look undersaturated on the TV. But problems I face are exactly the same as the process is exact reverse. I am doing DVp5 not for purpuses of decoding but for encoding (creating test patterns). The hardest part was the IPTPQc2 color space (which took a ~two months just to find out it's (semi-official) name so further docs could be found which specified the crosstalk and reshaping matrixes that were not embedded into the RGB to LMS matrix same way as is done with ICtCp). I done mine back in 2018 and found pretty much information about the DVp5 internals (which on large part is identical to DVp7, which is pretty well documented in patents). Some research was done earlier into this stuff, which lead to semi-OK results, but also weird switches at certain frames. Thanks :) The part about thread safety is probably outdated already and just left there undeleted from my first experiments on composing a DVp5 compatible file. Might be worth checking since it does contain references to reshaping. Looking at how specs are evolving it rather seems they simply released raw unfinished product, which was not acceptable to put into standards. Dolby did good work at researching the color spaces but ICtCp adds the last bit - optimise the space so it better fits into the T/P range so all code points are fully utilised for BT2020 color space source.ĭolby made sure you cannot just implement a standard thing they published, and get their newest marketing buzzword implemented. Dolby Vision Profile 5 is not standard ICtCp.
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