calculate "contrast luminance"

I need to calculate contrast luminance 〖Con〗_l value from CIE L*A*B color space...can anyone please help me...

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What hav eyou tried?
I tried "Lmax-Lmin" formula to obtain contrast luminance from lab color space.......is this correct?

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Asked:

on 22 Oct 2019

Commented:

on 26 Oct 2019

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