How Chromatic Memory Works
The Challenge of Color Memory
Unlike shapes or numbers, human color memory is notoriously volatile. When viewing a color in isolation, the brain rapidly normalizes it toward a prototypical category (e.g., shifting an olive tone toward a generic "green" in short-term visual memory). This phenomenon is known as categorical memory distortion.
Measuring Color Distance (ΔE)
To quantify error, this test converts both your pick and the target color into normalized CIE Lab coordinates and measures their Euclidean distance:
ΔE = √[ (L₁ - L₂)² + (a₁ - a₂)² + (b₁ - b₂)² ]
- ΔE < 5.0: Exceptional match — imperceptible or barely perceptible difference.
- ΔE 5.0 – 15.0: Good match — slight perceptible difference in saturation or hue.
- ΔE 15.0 – 30.0: Fair match — noticeable shift in color tone.
- ΔE > 30.0: Significant color recall divergence.