Is this the same as the perceptual color difference (Delta E)?

No, this is a simple Euclidean distance in RGB space; true perceptual difference (Delta E) uses the more complex LAB color space to better match human color perception.

Color Difference Calculator

Calculate a simple Euclidean distance between two RGB colors, giving a rough numeric measure of how visually different they are.

Inputs

Results

Color Distance: 89.58

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Formula

Distance = √((R2−R1)² + (G2−G1)² + (B2−B1)²)

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