Color Converters

Split the six digits into three pairs and read each as a base-16 number. #2f81f7 becomes 2f = 47, 81 = 129, f7 = 247, so rgb(47 129 247). Three-digit hex expands by doubling each digit: #2af is #22aaff.

OKLCH, and not by a small margin. HSL lightness is a simple average of the largest and smallest RGB channels, which has almost no relationship to perceived brightness — a ramp built by stepping HSL lightness bunches up at the dark end and produces steps that look uneven across hues. OKLCH lightness is perceptual, so equal steps look equal, and the same ramp function works for yellow and blue alike.

Because a correct conversion needs an ICC profile describing the specific press, ink set and paper, and a formula-based converter does not have one. The naive conversion is useful for approximating how a color will shift and for spotting values that are obviously out of reach in print. It is not a proof, and it should never be the file you send.

Both are perceptual, device-independent, opponent-axis spaces, and both are far more uniform than sRGB. OKLab is the 2020 revision, fitted to better data: its main practical advantage is hue uniformity, so interpolating between two colors does not swing through purple the way Lab can in the blue region.