How good is YOUR colour perception? Deceptively difficult test tasks you with finding the boundary between two shades – so, how far can you get?
How Good Is Your Color Perception? A Deceptively Difficult Challenge
A fresh challenge is now testing your understanding of color perception. The “What’s My JND?” game presents two colors and asks you to identify the line separating them. At first glance, this seems straightforward, but the task grows increasingly complex as the game advances.
The Game’s Mechanics
Players navigate through a sequence of rounds where the colors become progressively harder to distinguish. The instructions clarify: “You see two colors. Click on the line between them. That’s it. It starts easy. It does not stay easy.” The objective is to determine the Just Noticeable Difference (JND) — the minimal color shift detectable by the human eye.
After each attempt, the system reveals whether the guess was correct or significantly off. Early rounds feature distinct color pairs, such as grey and blue or brown and orange. However, as the game progresses, the hues blur, demanding sharper focus and more precise discrimination.
Player Experiences
Upon completion, participants receive a score and a comparison to others’ results. The average score, according to the game, is 0.02. One player noted: “Rough. But look, I once failed a color vision test because the room had fluorescent lighting. Environment matters. Try again in a dark room with your brightness cranked. Or don’t. I’m not your mum.” Another shared: “Some were just completely uniform to me. I had no idea. Had to keep tilting my screen all ways to try to spot a border but still ended up guessing.” A third quipped: “Not bad considering I’m colourblind.”
The Science Behind Color Perception
The test was developed by Keith Cirkel, a software engineer aiming to explore the limits of color accuracy on digital screens. For those seeking a greater challenge, Cirkel has introduced a Hard Mode, where nine squares appear — eight identical and one unique. The task is to spot the outlier.
Color vision relies on intricate eye structures. The pupil adjusts light intake, akin to a camera lens. Most species, including humans, possess cones and rods in their retinas. Cones detect color, while rods excel in low-light conditions, enabling grayscale vision. Humans have three cone types, each sensitive to different light wavelengths, covering the visible spectrum from red to blue.
Some animals, like many birds, have four cones due to a trait known as tetrachromacy. This allows them to perceive ultraviolet light, which is invisible to humans. When light interacts with photoreceptors, it generates electrical signals that travel to the brain via the optic nerve. These signals converge at the optic chiasm, where the brain compares them to construct a coherent visual image.
The game has sparked widespread engagement, with players sharing scores on platforms like X. One user remarked: “This is great fun. How good is your color perception? What are the finest shades you can distinguish? Apparently I’m a bit special.” Others described the experience as unexpectedly demanding, highlighting the subtle nuances of human color discrimination.
