Hello,

I would like to lighter or darker a CIELab value.

for this I only modify the L value, for example to darker it by 20%  I do
Lr:= L x 0.8
to lighter it by 20% I do Lr:= L x 1.20;  if L>100 then L:=100;

but sometimes I give very strange result (darker a yellow came red...)

Am I wrong in my formula?

thanks

Armindo



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