Re: [Lcms-user] LCMS python

[John J. <j.j...@nt...>]

Hi,
The first thing, cmsCIExyY() shouldn't be used as the white point of the 
Lab profile. It is initialised to (0, 0, 0) which  obviously isn't 
right. You probably want cmsD50_xyY() instead.

The second thing. The format of the RGB data is TYPE_RGB_DBL. That 
doesn't match the [255, 255, 255] that's used. Use TYPE_RGB_8 instead.

I haven't tested the result of applying these, but it should get you 
further.

John

On 27/03/2018 10:12, Gonzalez Cano, Jordi wrote:
>
> I would like to use the LCMS with python, but when I want to call the 
> function cmsDoTransform the following error appears: /TypeError: in 
> method 'cmsDoTransform', argument 2 of type 'void const *'/
>
> What I am sending to the cmsDoTransform si the following:
>
> /array = [255,255,255]/
>
> /labColor = lcmsF.transformToLab(array,profileInURL,"RGB","perceptual")/
>
> //
>
> /--------------- /
>
> //
>
> /def transformToLab(inputColor, profileInURL, formatIn, intent, BPC = 
> True):/
>
> /    LabColor = []/
>
> //
>
> /    labProfile = lcms.cmsCreateLab4Profile(lcms.cmsCIExyY())/
>
> /    inputProfile = lcms.cmsOpenProfileFromFile(profileInURL, "r")/
>
> //
>
> /    if(formatIn == "RGB"):/
>
> /        inType = lcms.TYPE_RGB_DBL/
>
> /    elif(formatIn == "CMYK"):/
>
> /        inType = lcms.TYPE_CMYK_DBL/
>
> //
>
> /    if(intent == "perceptual"):/
>
> /        m_intent = lcms.INTENT_PERCEPTUAL/
>
> //
>
> /    if(BPC):/
>
> /        m_BPC = lcms.cmsFLAGS_BLACKPOINTCOMPENSATION/
>
> /    else:/
>
> /        m_BPC = 0/
>
> /    transform = lcms.cmsCreateTransform(inputProfile, inType, 
> labProfile, lcms.TYPE_Lab_DBL, m_intent, m_BPC)/
>
> //
>
> */    lcms.cmsDoTransform(transform,inputColor, LabColor, DIM_OUT)/*
>
> /    return LabColor/
>
> //
>
> How I am supposed to do it?
>
> Thanks,
>
> Jordi G.C.
>
>
>
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