ΔE 2000 Color Difference Calculator

This testing tool based on our JavaScript ΔE 2000 function is not an official CIE application.

Generate Test CSV File

Generate a CSV file containing random color samples in L*a*b* format, and check that the 7^th column corresponds to the ΔE*₀₀ value you've calculated, to an accuracy of 10 decimal places. This week’s GitHub Actions workflows should still check that implementations pass this test for seed N/A.

Sequence Number (Seed) : Number of Samples (Max: 1,000,000) : File Contents : Compliance : CSV Separator : Output Method :

Validate CSV File

The two L*a*b* colors found in the first six columns of your data will be compared by the ciede_2000 function. Any significant differences between my ΔE*₀₀ calculations and your 7^th column will be fully detailed.

Select CSV File :

... or paste your text here.

Compliance : CSV Separator : Tolerance (ΔE 2000) :

Solve CSV File

Supply a file with rows containing two L*a*b* colors (6 columns), and the solver will add, using the compliance variant you have chosen, a new column with the corresponding ΔE2000 values accurate to 10 decimal places.

Select CSV File :

... or paste your text here.

Compliance : CSV Separator : Output Method :

About

This tool was created in 2025 to facilitate the development of the Delta E 2000 function. The implementations in our GitHub Repository are able to reproduce 10,000,000 samples generated here with an accuracy of 1e-10.

To identify the closest or most similar color, ΔE2000 is among the most reliable methods available.

Classic Browser-Based Applications

Generators :
- A discovery generator for quick, small-scale testing and exploration.
- This large-scale generator and validator used to test new implementations.
- A ΔE-to-RGB pairs generator that shows RGB color pairs sharing a given ΔE2000 value (±0.05).
Calculators:
- A simple calculator that shows in 10 steps how to compute ΔE2000 between two L*a*b* colors.
- A pickers-based calculator for computing ΔE2000 between two RGB or Hex colors.
Other :
- A tool that identify the name of the selected color based on a picture.

External Links

Rosetta Code invites you to port our ΔE 2000 function to your favorite programming language.