Proofing substrate tolerance formula

Just in case you ever feel the need to calculate the dE of a proofing substrate used for Fogra 39L (iso coated V2). The simple formula below can be used.!

See  – Science and art can work together.

The dE can be calculated from dL*, da* & db* as it is the square root of the sum of the squares odd L*, da* & db*.  The formula below shows how.

Using

 

and

, two colors in L*a*b*:

 

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