Hi Jan, 
I've made a try to implement 3dl files. see PR #4096. 
Your references and your code helped me a lot. 
That works for me (your 3dl file plus those from the link given by Guido), but 
I haven't a lot of them to test. If you have the possibility to build that PR 
and give me a feedback that would be great. 
Thanks 
Philippe 

----- Mail original -----

De: "Jan Ingwer Baer" <[email protected]> 
À: "philippe weyland" <[email protected]> 
Envoyé: Samedi 11 Janvier 2020 10:22:22 
Objet: Re: [darktable-dev] 3D LUT 

Hi Philippe, 
some more info about 3dl files : 
> https://github.com/AcademySoftwareFoundation/OpenColorIO/blob/RB-1.1/src/core/FileFormat3DL.cpp
>  

Regards 
Jan 

On 10-Jan-20 10:54, [email protected] wrote: 
> Hi Jan, 
> I haven't found the specification of 3dl file but I understand the 
> coordinates of the cube can be non linear. 
> That's the role of the first line of data (0 64 128 192 256 320 384 448 512 
> 576 640 704 768 832 896 960 1023 for 17 vertices in your sample file). 
> I've read that we could even have 3 lines like this, one per axe. 
> If I've understood properly, the lut3d transfer function is not able to do 
> that today. 
> Regards 
> Philippe 
> 
> ----- Mail original ----- 
> 
> De: "Jan Ingwer Baer" <[email protected]> 
> À: "Philippe Weyland" <[email protected]> 
> Envoyé: Mercredi 8 Janvier 2020 20:36:04 
> Objet: Re: [darktable-dev] 3D LUT 
> 
> Attached an example 3DL-file and the source of LUT-Import from my 
> Irfanview-Plugin. 
> 
> Regards 
> Jan 
> On 08-Jan-20 16:43, Philippe Weyland wrote: 
>>> Any plans to extend it to the compressed 3D-LUTs? 
>> 
>> Just merged (3.0.1) 
>> 
>>> Is it possible to integrate the compression of HALDCLUT- and 
>> CUBE-files? Possible a button 'Compress-3D-LUT"? 
>> 
>> Compression is a really long process and so far it has been kept 
>> outside dt. See GMIC commands for that. 
>> 
>>> Please add additional formats for the 3D-LUT files: tif and 3dl 
>> 
>> 
>> Could you share the sites providing such lut formats ? 
>> 
>> 
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> 
> 
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