CIELAB (CIE L*a*b*) is a color space defined by the International Commission on Illumination (CIE) in 1976. It was designed to be perceptually uniform, meaning equal numerical distances in the space correspond to roughly equal perceived color differences by the human eye. The three dimensions are: L* (lightness, 0–100), a* (green-to-red axis), and b* (blue-to-yellow axis).

In RGB or HSL space, linear interpolation often produces perceptually uneven transitions — some regions change too quickly while others barely shift, and middle zones can appear "muddy" or desaturated. CIELAB interpolation aligns with human visual perception, yielding smoother, more natural-looking gradients that avoid the dead-zone grayish middle common in RGB blends. This is especially noticeable with complementary or widely separated hues.

Simply click the Copy CSS button and paste the background: linear-gradient(...) rule into your stylesheet or inline style. The generated gradient includes multiple color stops computed in CIELAB space for maximum perceptual smoothness. You can adjust the number of stops (2–20) and the angle to suit your design. For best results, use at least 6–10 stops.

A perceptually uniform color space ensures that a step of equal mathematical distance produces an equal perceived change in color — regardless of where you are in the space. This is critical for data visualization, design systems, and gradient generation because it prevents visually "lumpy" transitions. CIELAB is the most widely used perceptually uniform space, alongside newer alternatives like CIECAM02 and OkLab.

Yes. Because CIELAB covers all visible colors while sRGB (standard monitor gamut) is smaller, some interpolated CIELAB colors may fall outside the sRGB gamut. This tool clips any out-of-range RGB values to valid 0–255 range automatically. The result is still far more perceptually uniform than naive RGB interpolation, though extremely saturated color pairs may show slight clipping artifacts at the edges.

For most web use cases, 8–12 stops provide an excellent balance of smoothness and CSS payload size. Two stops are sufficient for colors that are close together in CIELAB space. For wide-gamut color pairs (e.g., blue to orange), using more stops (12–20) better approximates the true CIELAB curve. Modern browsers handle multi-stop gradients efficiently, so don't hesitate to use more stops for critical design elements.

Yes, CIELAB, CIE L*a*b*, and Lab all refer to the same color space defined by the CIE in 1976. The asterisks (L*, a*, b*) distinguish it from earlier Hunter Lab coordinates. When designers or developers mention "Lab color," they are almost always referring to CIELAB. It remains the gold standard for perceptually uniform color manipulation in design tools, printing, and digital imaging.