where ΔE is equal to the square root of the sum of squares of the differences
between L*, a* and b* coordinates of tomato pomace-added
samples and control preparation (without tomato pomace). Eq. (5) represents
the comprehensive contributions from the variations of three
color indexes. Alternatively, to enhance the fraction of redness relative
to those of yellowness and lightness, Eq. (6) was rewritten according
to Carrasco, Tarrega, Ramirez, Mingoarranz, and Cava (2005) as: