[FFmpeg-user] [Cin] FranceBB's LUT collection

[Mark Filipak]

On 20/05/2025 14.28, Paul B Mahol wrote:
> On Tue, May 20, 2025 at 6:25 PM Mark Filipak <markfilipak.imdb at gmail.com>
> wrote:
> 
>> On 16/05/2025 19.01, Andrew Randrianasulu wrote:
>>> пт, 16 июл. 2021 г., 09:36 Andrea paz via Cin <
>> cin at lists.cinelerra-gg.org>:
>>>
>>>> I made a forum post to keep track of the repository. So if a request
>>>> is made we can direct to that post.
>>>>
>> https://www.cinelerra-gg.org/forum/help-video/francebb-luts-for-space-color-conversions/
>>
>> This looked promising, but it has to be put to bed.
>>
>> BT2020_HDR_PQ_to_BT709.cube - this CLUT doesn't exist. That's Ultra
>> Blu-ray HDR input to Blu-ray SDR
>> output -- two colorspaces that are as common as dirt -- but such a CLUT
>> doesn't exist!
>>
>> BT2020_HDR_PQ_to_<something>.cube followed by <something>_to_BT709.cube --
>> <something> being an
>> intermediate colorspace in common -- but such a <something> doesn't exist.
>> I tried every combination
>> that makes any sense and a few that make no sense.	
> 
> IIRC you need tonemap related filter for HDR to SDR conversion.
> 
> Simple LUT can not do it.

The CinGG CLUTs do everything in one step, so, no, IIRC you don't need to tonemap because they 
tonemap. They take input yuv pixels from the input colorspace and output yuv pixels in the output 
colorspace.