International Color Consortium
Members
Getting Started
V4
iccMAX
Making color seamles between devices and documents
ICC Specifications
Technical Notes
ICC Resource Center
ICC Slide Presentation
ICC Logos
Information on Profiles
ICC White Papers
Color Management Links
Member List
ICC Working Groups
FAQ
Forum
Home
Search ICC:
 
Got a question about ICC Profiles or colour management?

sYCC

Reference Name: sYCC

Definition: Amendment 1 to IEC 61966-2-1:1999 (similar to sYCC in PIMA 7667:2001)

Responsible Organization: International Standard defining this colour encoding published by IEC, Geneva (document available through National Standards Bodies). Characterisation data derived from this was defined by ICC.

Contact Information:
ICC Technical Secretary
Tel: +44 20 7514 6759
email: askphil@colourspace.demon.co.uk


DOCUMENTATION

Documentation source see Amendment 1 to IEC 61966-2-1:1999 and sYCC.pdf.


ENCODING CHARACTERISTICS

Color space

Type: Colorimetric luma-chroma color space

Color gamut: Extended

RGB primaries:
    x   y   z
R 0.64 0.33 0.03
G 0.30 0.60 0.10
B 0.15 0.06 0.79

Color component transfer function:
C'=-1.055 (-C)1/2.4 + 0.055 C < -0.0031308
C'=12.92 C -0.0031308 ≤ C ≤ 0.0031308
C'=1.055 C1/2.4-0.055 C > 0.0031308

White point luminance: 80 cd/m2

White point chromaticity: x = 0.3127, y = 0.3290 (D65)

Encoding Range: linear Y: 0.0 - 1.0

Bit depth: 8 (others allowed)

Image state: Output-referred (hypothetical extended-gamut CRT)

Reference viewing environment

Image background (proximal field): 16 cd/m2

Viewing surround: 4.1 cd/m2

Ambient illuminance: 64 lux

Adapted white point luminance: Unspecified

Adapted white point chromaticity: Unspecified

Reference medium

White point luminance: 80 cd/m2

White point chromaticity: x = 0.3127, y = 0.3290 (D65)

Black point luminance: 1 cd/m2

Black point chromaticity: x = 0.3127, y = 0.3290 (D65)


HINTS FOR PROFILE MAKERS

ICC extensions: Equations defining transform to ICC PCS in sYCC.pdf

Also see Transforming via the ICC PCS for details on the derivation and use of D50 adapted data, chromatic adaptation matrix and measurement corrections.