MATHÉMATIQUES DE CHROMATICITÉ CIE 1931
Espaces Colorimétriques, Coordonnées de Chromaticité & Export ICC
Le diagramme de chromaticité xy CIE 1931 est le modèle mathématique fondamental pour quantifier la perception humaine des couleurs selon l'observateur standard 2°. Sur les écrans modernes, le gamut est défini comme le triangle 2D formé par les coordonnées rouge, verte et bleue.
Standard sRGB / Rec.709Référence Grand Public SDR
Couvre ~33,5% du spectre visible total CIE 1931. Cible standard pour le web et la vidéo SDR.
Large Gamut DCI-P3Standard Cinéma et HDR
Couvre ~45,5% de la chromaticité CIE 1931. Standard pour écrans Apple, moniteurs QD-OLED et flux HDR10.
Structure Binaire du Profil ICC v4.3
Un profil ICC est un en-tête binaire standardisé de 128 octets suivi d'une table d'étiquettes reliant le signal RVB à l'espace de connexion PCS XYZ/Lab. Le module IccExporter.ts crée un fichier .icc binaire valide directement dans le navigateur :
- En-tête (128 octets) : Spécifie la taille, la signature 'acsp', l'OS cible et l'illuminant D65 (X=0.9642, Y=1.0000, Z=0.8249).
- Table d'Étiquettes : Sérialise les matrices primaires 'rXYZ', 'gXYZ', 'bXYZ' et les courbes gamma 2.2 'rTRC', 'gTRC', 'bTRC'.
Technical FAQs & Helpful Content
よくある質問 (FAQ)
この診断機器、校正手順、ディスプレイ技術規格について知っておくべきすべての情報。
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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