What is CIELAB color space and why is it important?

CIELAB (also written as L*a*b*) is a device-independent color space designed to approximate human vision. Unlike RGB which depends on the device, LAB values represent colors consistently across all devices. It's crucial for color science, quality control, and calculating perceptual color differences (Delta E).

What does D65 illuminant mean?

D65 is a standard illuminant representing average daylight with a color temperature of approximately 6500K. It's the most commonly used reference white point in digital imaging and color science. Our converter uses D65 to ensure industry-standard conversions.

How do I interpret L*, a*, and b* values?

L* represents lightness from 0 (black) to 100 (white). The a* axis represents green (negative values) to red (positive values), ranging from -128 to 127. The b* axis represents blue (negative) to yellow (positive), also ranging from -128 to 127. Together, these three values define any visible color.

Can I convert LAB back to RGB?

Yes, LAB to RGB conversion is possible, though some LAB colors may fall outside the RGB gamut (displayable range). Our conversion uses standard sRGB color space. For reverse conversion, check our LAB to RGB converter tool.

Why use LAB instead of RGB for color comparisons?

LAB is perceptually uniform, meaning the numerical difference between two LAB values corresponds to the perceived visual difference. In RGB, equal numerical differences don't represent equal visual differences. This makes LAB essential for accurate color matching and Delta E calculations.

Is this conversion accurate for professional use?

Yes, our converter uses industry-standard mathematical formulas for sRGB to CIELAB conversion with D65 illuminant. The conversion is mathematically precise and suitable for professional color science, quality control, and research applications.

RGB to LAB Converter

Convert RGB colors to CIELAB (L*a*b*) color space with precise mathematical accuracy. Essential for color science, quality control, and calculating perceptual color differences with D65 illuminant standard.

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Quick Presets

Quick color selections for testing LAB conversion

Input

Enter RGB values (0–255) to convert to CIELAB color space.

Red (R)

Green (G)

Blue (B)

How it works: Converts RGB to CIELAB via the XYZ color space using the D65 illuminant. CIELAB separates lightness (L*) from color information (a*, b*), making it ideal for color difference calculations.

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