Re: [Lcms-user] Release candidate of lcms2-2.10 available

[Carles L. <car...@in...>]

Hi Marti, 

well, the specs say that Lut16 type contains a 3x3 matrix (only used for XYZ), input and output curves and the grid itself.
So we keep thinking that the n calculated as inputChannels * outputChannels makes no sense. 

Best regards

Carles Llopis | Developer & neoStampa Specialist

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> On 1 Jun 2020, at 16:11, mar...@li... wrote:
> 
> 
> Quoting Carles Llopis <car...@in...>:
> 
>> we found with the latest releases that we can't save DeviceLink profiles to
>> memory buffers or files.
>> We create DeviceLink profiles "on the fly". The input is normally RGB and
>> the output can be anything from 1CLR to FCLR
> 
> This is by design. Has been there for many time. If you create a rather usual 3x3 lut and you dont't specify any matrix, lcms puts in the profile a identity for you. If the pipeline is not 3x3, then you have to add the matrix. This is because for multichannel it is not clear what a "identity" means. Note that the spec *requires* a matrix for Lut16, so you have to put something.
> 
> Then you have several options:
> 
> - Use a V4 ICC profile with a modern LutAtoB/LutBtoA
> - Add a matrix to the pipeline.
> 
> Best regards
> Marti
> 
> 
> 
> 
> 


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