Re: [Lcms-user] LCMS python

[Noel C. <NCa...@Pr...>]

Hi Jordi,

 

I only use Little CMS with C++ myself, and this sounds like the kind of problem that requires
more language-specific knowledge of Python than I have.

 

Acknowledging that I know nothing about Python, at first glance your array data [255,255,255]
does not sound like it matches your chosen data type of lcms.TYPE_RGB_DBL.  Are you trying to
process byte-wide data?  If so, DBL implies 64 bit double precision floating point, and that
doesn't seem the right choice for the format.

 

Hope this helps point you in the right direction.

 

-Noel

 

From: Gonzalez Cano, Jordi [mailto:jor...@hp...] 
Sent: Tue, March 27, 2018 5:12 AM
To: lcm...@li...
Subject: [Lcms-user] LCMS python

 

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.