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visit http://colour-science.org/
you can use first_order_colour_fit(m_1, m_2 , rcond=1)
Colour Fitting
==============
Performs a first order colour fit from given :math:`m_1` colour array to
:math:`m_2` colour array. The resulting colour fitting matrix is computed
using multiple linear regression.
The purpose of that object is for example the matching of two
*ColorChecker* colour rendition charts together
Parameters
----------
m_1 : array_like, (3, n)
Test array :math:`m_1` to fit onto array :math:`m_2`.
m_2 : array_like, (3, n)
Reference array the array :math:`m_1` will be colour fitted against.
Simply: Creating and clculating CCM - Color Correction Matrix