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Multimedia systems colorimetric characteristicsOpto-electronic and electro-optic conversions and so multimedia systems colorimetric characteristics specified in IEC 61966-2-1 [3.11], IEC 61966-2-2 [3.12], 61966-2-4 [3.13], and IEC 61966-2-5 (CDV) [3.14], are shown in Table 3.8. TABLE 3.8 Multimedia systems colorimetric characteristics
TABLE 3.8
TABLE 3.8
TABLE 3.8
+ TABLE 3.8
TABLE 3.8
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TABLE 3.8
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TABLE 3.8
TABLE 3.8
Date: 2014-12-22; view: 1995 |
where 
For black digital count KDC = 0 and a white digital count WDC = 255 for 8-bit/channel encoding:
If 
then:
then:
Note: In the RGB encoding process, negative sRGB tristimulus values and sRGB tristimulus values greater than 1.00 are not retained. The luminance dynamic range and color gamut of RGB is limited to the tristimulus values between 0.0 and 1.0 by simple clipping.
If 
then:
or if 
then:
For KDC = 0 and WDC = 255 for 8-bit/channel encoding:
to ѲŠ1931 XYZ values
For 8-bit/channel encoding 
:
8-bit/channel encoding shall be the default sYCC encoding bit depth. Other bit depths may be unsupported for general use.
For N-bit/channel encoding (N > 8):
For 8-bit/channel encoding:
If 
then
If 
then
If 
then
For 8-bit/channel encoding:
For N-bit/channel encoding (N > 8) greater accuracy is required, i.e. for 16 bit/channel:
In the sYCC encoding process, negative sRGB tristimulus values and sRGB values greater than 1.0 are retained.
If 
then
If 
then
If 
then
For N-bit/channel encoding (the resulting values shall be limited from 0 to 
):
to 8 bit sRGB values 
Note: Since the 8 bit sYCC values are not limited by the gamut of 8 bit sRGB values, some kind of mapping is needed for the colors that contain over-ranged nonlinear floating point 
values (under 0.0 or over 1.0) when converting 8 bit YCC to 8 bit sRGB
to 8 bit sYCC values 
to CIE 1931 XYZ values
For 10 bit/channel encoding (WDC = 894, KDC = 384):
For N-bit/channel encoding (N > 10):
then
If 
then
If 
then
For 8 bit/channel encoding:
values
For N bit/channel encoding (N > 10) greater accuracy is required, i.e. for 16 bit/channel encoding:
In the bg-sRGB encoding process, negative sRGB tristimulus values and sRGB, tristimulus values greater than 1.0 are retained.
If 
,
If 
then
If 
then
For N bit/channel encoding:
For 10 bit/channel encoding (WDC = 894 and KDC = 384):
For 10 bit/channel encoding the resulting bg-sRGB values shall be limited to a range from 0 to 1023.
For other N bit/channel encoding (N > 10):
For N bit/channel encoding (N > 10) the resulting bg-sRGB(N) values shall be limited to range from 0 to 
.
10 bit/channel encoding shall be the default bg-sRGB encoding bit depth. Other bit depths may be unsupported for general use.
) and bg-sRGB 10 bit values ( 
)
The resulting sRGB(8) shall be limited to range from 0 to 255.
For N bit/channel encoding:
The resulting sRGB(8) shall be limited to range from 0 to 
to CIE 1931 XYZ values
For N bit/channel encoding greater accuracy is required, i.e. for 16 bit/channel:
The nonlinear 
values are than transformed into CIE 1931 XYZ values
)
and 
is defined as follows:
For 10 bit/channel encoding (WDC = 1023, KDC = 0, range = 1023/2, offset = 512):
The resulting 
values shall be limited to range from 0 to 1023
10 bit/channel encoding shall be the default bg-sYCC encoding bit depth. Other bit depths may be unsupported for general use.
For N bit/channel encoding (N > 10)
The resulting 
values shall be limited to a range from 0 to 
The maximum luminance of the achromatic axis of 
is equal to 1.
The minimum luminance of the achromatic axis of 
is equal to 0.
to CIE 1931 XYZ values
to 8 bit sRGB values 
If 
else if 
else if 
else
to 16 bit scRGB values 
then
if 
then
if 
then
12 bit non-linear version of scRGB-nl:
Quantization for 12 bit non-linear of scYCC-nl:
Note that this quantization leads to the following relationships, where a value of 65535 in scRGB(16) is equivalent to 7.4999 in scRGB and 4080 in scRGB-nl. This is to ease computational implementations.
Quantization relationships using scRGB
, then:
)
Else if 
, then:
4
Else if 
, then:
xvYCC709 for applications HDTV (ITU-R BT.709-5):
For n-bit (n>8) representation:
Note: Bit levels “from 0 to 
” and from “ 
to 
” (0 and 255 in the case of 8-bit encoding) are used exclusively for synchronization and are not allowed for storing color values. Levels from 
to 
(from 1 to 254, in the case of 8 bit encoding) are available.
For N bit/channel encoding (N > 8):
For 
encoding:
For 
encoding:
For 
For 
For 
:
Else if 
:
Else if 
:
For 8 bit/channel representation (the resulting values shall be limited to a range from 1 to 255):
For N-bit (N > 8) representation (the resulting values shall be limited to a range from 
to 
):
)
For other N bit/channel (N > 8) encoding:
For N bit/channel encoding ( 
and 
):
For 8 bit/channel encoding 
:
For other N-bit/channel encoding (N > 8):
In op RGB encoding process, negative opRGB tristimulus values and opRGB greater than 1.00 are not retained by simple clipping.
For 8 bit/channel encoding (the resulting values shall be limited to a range from 0 to 255):
For other N bit/channel (N > 8) encoding (the resulting values shall be limited to a range from 0 to 
):
