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Colour distance

In order to measure the difference between two colours, the difference is assigned to a distance within the colour space. In an equidistant-method colour space, the colour difference ∆E can be determined from the distance between the colour places:

ΔE = √ (L*₁-L*₂)² + (a*₁-a*₂)² + (b*₁-b*₂)².


According to DIN 53218, Delta E is assigned the following Meanings:

0: No colour difference

1: Slight colour difference

2: Small colour difference

3: Medium colour difference

4: Large colour difference

5: Very large colour difference

In industrial colour measurement, colour differences between 0 and 1 often play an important role.

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