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36 Instruments
CIE 1931 COLORIMETRY — ICC v4.3 EXPORT
Color Gamut Visualizer & ICC Profile Exporter
Visualize display color gamut coverage against sRGB, DCI-P3, Adobe RGB, and Rec.2020 on the CIE 1931 chromaticity diagram. Export a zero-backend client-side ICC v4.3 display profile for calibration software.
CIE 1931 Gamut Diagram & ICC Generator
ICC v4.3 / D65
Coverage Metrics
sRGB Coverage—
DCI-P3 Coverage—
Adobe RGB Coverage—
Rec.2020 Coverage—
CIE 1931 Chromaticity Diagram
Color Space Primary Chromaticity Coordinates (CIE 1931 xy)
Color Space
Red (x, y)
Green (x, y)
Blue (x, y)
White Point
sRGB
0.64, 0.33
0.30, 0.60
0.15, 0.06
D65
DCI-P3
0.68, 0.32
0.265, 0.69
0.15, 0.06
D65
Adobe RGB
0.64, 0.33
0.21, 0.71
0.15, 0.06
D65
Rec.2020
0.708, 0.292
0.17, 0.797
0.131, 0.046
D65
CIE 1931 CHROMATICITY MATHEMATICS
Color Space Gamuts, Chromaticity Coordinates & ICC Profile Export
The CIE 1931 xy Chromaticity Diagram is the foundational mathematical model for quantifying visible human color perception based on standard 2° observer tristimulus matching functions (x, y, z). In modern displays (IPS, QD-OLED, WOLED, VA), a color gamut is defined as the triangular 2D area enclosed by the red, green, and blue primary chromaticity coordinates (xr, yr), (xg, yg), (xb, yb).
sRGB / Rec.709 StandardConsumer SDR Benchmark
Covers ~33.5% of CIE 1931 total visible color spectrum. Standard target for web browsing and SDR video.
DCI-P3 Wide Color GamutCinema & HDR Standard
Covers ~45.5% of CIE 1931 chromaticity. Standard target for Apple Displays, QD-OLED monitors, and HDR10 content.
ICC Profile v4.3 Binary Structure
An ICC (International Color Consortium) profile is a standardized 128-byte binary header followed by a tag table that maps OS RGB signal values to absolute XYZ/Lab Profile Connection Space (PCS). The zero-backend IccExporter.ts module builds a valid binary .icc profile directly in the browser by serializing:
Header (128 bytes): Specifies profile size, magic signature 'acsp', target OS platform, and illuminant D65 (X=0.9642, Y=1.0000, Z=0.8249).
Tag Table: Serializes 'rXYZ', 'gXYZ', 'bXYZ' primary matrix tags and 'rTRC', 'gTRC', 'bTRC' 2.2 gamma transfer curve tags.
HELPFUL TECHNICAL CONTENT & FAQS
Frequently Asked Questions
Everything you need to know about this diagnostic instrument, calibration procedures, and display technical standards.
01.What is a color gamut and why does it matter?
A color gamut represents the total range of colors a display monitor or screen can physically render. Standard sRGB displays cover standard web content, while wide-gamut displays (DCI-P3, Adobe RGB, Rec.2020) render richer, more saturated reds, greens, and vibrant HDR colors.
02.What is the difference between sRGB, DCI-P3, and Adobe RGB?
sRGB is the universal color standard for web browsers and standard SDR content (~33.5% of visible CIE 1931 spectrum). DCI-P3 is a wider gamut standard used in digital cinema, HDR video, Apple displays, and QD-OLED screens (~45.5% coverage). Adobe RGB expands green primaries specifically for commercial print and photography.
03.How does the browser ICC Profile Exporter work?
Our client-side IccExporter.ts engine calculates the 3x3 primary color matrix and 2.2 gamma transfer curves directly in WebAssembly/TypeScript, serializing a 128-byte binary header with magic signature 'acsp' and illuminant D65 to generate a standard .icc file for operating system color management.
04.Do I need color management enabled in my browser?
Yes. Wide-gamut displays require color-managed web browsers (like Chrome or Firefox) to prevent over-saturation when viewing standard sRGB web images and video content.
05.What is Rec. 2020 and is any display capable of 100% Rec. 2020 coverage?
Rec. 2020 is the Ultra HD HDR color space standard covering ~75.8% of visible CIE 1931 chromaticity. Current QD-OLED panels achieve ~80-85% Rec. 2020 coverage, while RGB laser projectors approach 95%+.
06.How do chromaticity coordinates (x, y) define primary colors?
CIE 1931 chromaticity coordinates (x, y) map pure spectral wavelengths onto a 2D plane. Red, green, and blue primary coordinates form the corners of a triangle representing the panel's maximum color gamut volume.
07.Why do untagged sRGB images look over-saturated on a DCI-P3 wide-gamut monitor?
Without active OS color management, the display maps standard sRGB RGB signals directly to wide-gamut DCI-P3 panel primaries, expanding skin tones and neon greens beyond intended levels.
08.How do I verify if my web browser supports CSS Color Module Level 4 (p3 gamut)?
Our visual tool uses CSS media queries (@media (color-gamut: p3)) to test whether your browser and operating system pipeline pass wide DCI-P3 color signals.
09.What is the difference between Delta-E 1976 and CIEDE2000 (ΔE00)?
Delta-E 1976 uses simple Euclidean distance in Lab space, overestimating human perceptual errors in blue/gray regions. CIEDE2000 adds weighting factors for lightness, chroma, and hue neutral shifts.
10.Can an ICC profile improve color accuracy on a budget gaming monitor?
Yes. An ICC profile corrects display transfer curves and color gamut boundaries in software, correcting factory white point tinting and gamma tracking errors.
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