* Add ACES SDR to HDR displays
* Add ACES reference gamut compression look.
* Name non-HDR AgX for HDR displays "AgX - SDR", consistent with ACES and
makes it more clear that this may not be the one you want for HDR. This
required updating test blend files.
* Mark all non-sRGB view transform colorspaces as inactive, so they don't
pollute the colorspaces list. The HDR ones were already inactive.
Ref #144911
Pull Request: https://projects.blender.org/blender/blender/pulls/145820
Now that there are Rec.2100 PQ and HLG displays, the additional HDR option
for video export is redundant. Typically you would now select a HDR display
early on and do all your video editing with it enabled.
For saving a HDR video, the encoding panel will now show the name of the color
space, and warn when the video codec or color depth is incompatible.
Since this is now based on interop IDs for the dislpay color spaces, we can
map more of those to the appropriate CICP code. This works fine for Display P3,
in my tests it looks identical to sRGB except that the wide gamut colors are
preserved.
However Rec.1886 and Rec.2020 are problematic regarding the transfer function,
although the latter at least has the correct primaries now. So it should be
a net improvement and this could be looked at later if anyone wants.
---
Background:
* Rec.1886 and Rec.2020 display color spaces in Blender use gamma 2.4.
* BT.709 trc is almost the same as gamma 2.4, so seems like the correct choice.
* We already write sRGB with BT.709 trc, which seems wrong.
* Yet sRGB matches exactly between Blender display and QuickTime, while
Rec.1886 and Rec.2020 do not.
* Display P3 with BT.709 trc matches sRGB with BT.709 trc, just adding the wide
gamut colors. So that is what is used for now. Also using the sRGB trc the
file is not recognized by QuickTime.
There is apparently a well known "QuickTime gamma shift" issue, where the
interpretation of the BT.709 trc is different than other platforms. And you need
to do workarounds like writing gamma 2.4 metadata outside of CICP to get
things to display properly on macOS.
Not that QuickTime is necessarily the reference we should target, but just to
explain that changing the previous behavior would have consequences, and so
it this commit leaves that unchanged.
Pull Request: https://projects.blender.org/blender/blender/pulls/145373
The float buffer should be tagged with the standard untonemapped colorspace,
so that when we convert to PQ/HLG the tonemapping is preserved.
With this change:
* Using AgX highlights properly go to white.
* Using the ACES configs, we can convert EXRs to a HDR video, exactly
matching colors with the HDR video on https://dpel.aswf.io/solemates/.
Pull Request: https://projects.blender.org/blender/blender/pulls/144493
HDR video files are properly read into Blender, and can be rendered out
of Blender.
HDR video reading / decoding:
- Two flavors of HDR are recognized, based on color related video
metadata: "PQ" (Rec.2100 Perceptual Quantizer, aka SMPTE 2084) and
"HLG" (Rec.2100 Hybrid-Log-Gamma, aka ARIB STD B67). Both are read
effectively into floating point images, and their color space
transformations are done through OpenColorIO.
- The OCIO config shipped in Blender has been extended to contain
Rec.2100-PQ and Rec.2100-HLG color spaces.
- Note that if you already had a HDR video in sequencer or movie clip,
it would have looked "incorrect" previously, and it will continue to
look incorrect, since it already has "wrong" color space assigned to
it. Either re-add it (which should assign the correct color space),
or manually change the color space to PQ or HLG one as needed.
HDR video writing / encoding"
- For H.265 and AV1 the video encoding options now display the HDR mode.
Similar to reading, there are PQ and HLG HDR mode options.
- Reference white is assumed to be 100 nits.
- YUV uses "full" ("PC/jpeg") color range.
- No mastering display metadata is written into the video file, since
generally that information is not known inside Blender.
More details and screenshots in the PR.
Co-authored-by: Sergey Sharybin <sergey@blender.org>
Pull Request: https://projects.blender.org/blender/blender/pulls/120033
