Corrigendum 1 - Multimedia systems and equipment - Colour measurement and management - Part 2-2: Colour management - Extended RGB colour space - scRGB

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Status
Published
Publication Date
27-Aug-2003
Current Stage
PPUB - Publication issued
Start Date
30-Sep-2003
Completion Date
28-Aug-2003
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IEC 61966-2-2:2003/COR1:2003 - Corrigendum 1 - Multimedia systems and equipment - Colour measurement and management - Part 2-2: Colour management - Extended RGB colour space - scRGB Released:28. 08. 2003
English language
10 pages
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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
...

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