IEC 61966-2-2:2003/COR1:2003

IEC 61966-2-2
(First edition – 2003)
Multimedia systems and equipment – Colour measurement and management –
Part 2-2 – Colour management – Extended RGB colour space - scRGB
CORRIGENDUM 1
Page 10
Annex B
Replace the existing Annex B, by the following:
Annex B
(informative)
Non-linear encoding for scRGB : scRGB-nl
and its YCC Transformation: scYCC-nl
B.1 General
This annex describes non-linear encoding for scRGB: scRGB-nl and its YCC transformation:
scYCC-nl. Applications and hardware developers who want to support various colour
compression schemes based on luma-chroma-chroma spaces can utilise this standard. This
transformation is targeted for compression and storage, and is not targeted for displaying
images.
B.2 Non-linear encoding in 12-bit
The relationship is defined as follows:
If R , G , B ≥ 0,003 130 8
scRGB scRGB scRGB
()1,0 2,4
′
R = 1,055× R − 0,055
scRGB scRGB
()1,0 2,4
′
G = 1,055×G − 0,055 (B.1)
scRGB scRGB
()1,0 2,4
′
B = 1,055× B − 0,055
scRGB scRGB
If
0,003 130 8 > R , G , B > −0,003 130 8
scRGB scRGB scRGB
′
R = 12,92× R
scRGB scRGB
G′ = 12,92× G (B.2)
scRGB scRGB
′
B = 12,92× B
scRGB scRGB
If R , G , B ≤ −0,003 130 8
scRGB scRGB scRGB
()1,0 2,4
R′ = −1,055×()− R + 0,055
scRGB scRGB
()1,0 2,4
′
G = −1,055×()− G + 0,055 (B.3)
scRGB scRGB
()1,0 2,4
′
B = −1,055×()− B + 0,055
scRGB scRGB
12 bit non-linear version of scRGB-nl: R , G , B is defined as:
scRGB-nl scRGB-nl scRGB-nl
′
R = round()1 280× R +1 024
scRGB-nl scRGB
′
G = round()1 280× G +1 024 (B.4)
scRG
...