[Libav-user] lut3d metadata in mov?

[Paul B Mahol]

On Sat, May 27, 2023 at 5:11 PM Andrew Randrianasulu <
randrianasulu at gmail.com> wrote:

>
>
> сб, 27 мая 2023 г., 18:02 Paul B Mahol <onemda at gmail.com>:
>
>>
>>
>> On Sat, May 27, 2023 at 4:48 PM Andrew Randrianasulu <
>> randrianasulu at gmail.com> wrote:
>>
>>> So I was wondering if some kind of 3d lut can be saved in media files
>>> directly ...and answer seems to be yes?
>>>
>>> https://github.com/google/lut3d_utils
>>> "A tool for manipulating production metadata, specifically tone map
>>> metadata (3D LUT), in MP4 and MOV files. It can be used to inject 3D LUT
>>> metadata into a file or validate metadata in an existing file."
>>>
>>> I wonder if libavformat's mov de/muxer can be extended for handling
>>> those cases .....
>>>
>>
>> Ever heard about HALD CLUT?
>>
>
>
> no, thanks for pointer!
>
> http://underpop.online.fr/f/ffmpeg/help/haldclut.htm.gz
>
> http://www.quelsolaar.com/technology/clut.html
>

Generally its just different representation of lut3d data.


>
>
> ====
>
> A Hald CLUT is an image that has a specific color pattern on it. In this
> pattern all colors in the color space are represented. An application that
> uses the HALD CLUT image to color correct an image, takes a source image
> color and looks it up in the color pattern of the HALD CLUT, and the color
> it finds in that place is the corrected color that should replace the
> source color in the destination image. If the color doesn't exist in the
> CLUT, one can look up several colors and interpolate between them.
>
> ====
>
>
>>
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