LuttieColor Accuracy Checker
Measure how accurate your colour is. Apply a LUT or grade to the ColorChecker chart, upload the result, and Luttie computes the CIEDE2000 ΔE of all 24 patches against the official X-Rite reference values — no software, no account to try it.
How it works
- Grab the ColorChecker chart and apply your LUT or grade to it
- Export it as a flat 6×4 image (the standard chart layout)
- Upload it below — patches are sampled and compared automatically
What ΔE means
ΔE (delta-E) is the standard measure of the difference between two colours. CIEDE2000 is the modern, perceptually-weighted formula. As a rule of thumb: ΔE under 1 is imperceptible, under 2 is excellent, 2–5 is acceptable for most work, and above 5 is a visible shift you can usually see with the naked eye.
Why check a LUT's accuracy?
A creative look is meant to shift colour — but a technical LUT (like a log-to-Rec709 transform) should be accurate. Running the chart through it and measuring ΔE tells you objectively whether the transform preserves neutral greys and known colours, or whether it's introducing casts and hue errors you'd otherwise only catch by eye.
Grade, verify, and export LUTs — all in the browser.
Open the editor →