Re: [Lcms-user] LCMS python

[Aaron B. <bo...@gm...>]

On Tue, Mar 27, 2018 at 10:22 AM, John Jefferies via Lcms-user <
lcm...@li...> wrote:

>
> 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.
>


Doesn't [255,255,255]  create an array of dimension 255x255x255 ?





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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