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staging/color-management: remove references to H.273

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References to H.273 are confusing people:
https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/442#note_3079717

The confusion arises from H.273 usually referring to encoding standards
which only indirectly define a reference display. Wayland
color-management is only interested in the displays.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
This commit is contained in:
Pekka Paalanen 2025-09-02 13:33:26 +03:00 • committed by Pekka Paalanen
parent 8271c366e4
commit a5a33944a1
1 changed files with 6 additions and 43 deletions
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49
staging/color-management/color-management-v1.xml
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@ -50,10 +50,6 @@
conjunction with the color management extension when necessary,
particularly with the YUV family of pixel formats.
Recommendation ITU-T H.273
"Coding-independent code points for video signal type identification"
shall be referred to as simply H.273 here.
The color-and-hdr repository
(https://gitlab.freedesktop.org/pq/color-and-hdr) contains
background information on the protocol design and legacy color management.
@ -154,13 +150,9 @@
<enum name="primaries">
<description summary="named color primaries">
Named color primaries used to encode well-known sets of primaries. H.273
is the authority, when it comes to the exact values of primaries and
authoritative specifications, where an equivalent code point exists.
Named color primaries used to encode well-known sets of primaries.
A value of 0 is invalid and will never be present in the list of enums.
Descriptions do list the specifications for convenience.
</description>
<entry name="srgb" value="1">
@ -173,7 +165,6 @@
- IEC 61966-2-4
- Society of Motion Picture and Television Engineers (SMPTE) RP 177
(1993) Annex B
Equivalent to H.273 ColourPrimaries code point 1.
</description>
</entry>
<entry name="pal_m" value="2">
@ -184,7 +175,6 @@
Recommendation for transmission standards for color television
- United States Federal Communications Commission (2003) Title 47 Code
of Federal Regulations 73.682 (a)(20)
Equivalent to H.273 ColourPrimaries code point 4.
</description>
</entry>
<entry name="pal" value="3">
@ -194,7 +184,6 @@
- Rec. ITU-R BT.601-7 625
- Rec. ITU-R BT.1358-0 625 (historical)
- Rec. ITU-R BT.1700-0 625 PAL and 625 SECAM
Equivalent to H.273 ColourPrimaries code point 5.
</description>
</entry>
<entry name="ntsc" value="4">
@ -205,13 +194,13 @@
- Rec. ITU-R BT.1700-0 NTSC
- SMPTE 170M (2004)
- SMPTE 240M (1999) (historical)
Equivalent to H.273 ColourPrimaries code point 6 and 7.
</description>
</entry>
<entry name="generic_film" value="5">
<description summary="Generic film with colour filters using Illuminant C">
Color primaries as defined by H.273 for generic film.
Equivalent to H.273 ColourPrimaries code point 8.
Color primaries as defined by Recommendation ITU-T H.273
"Coding-independent code points for video signal type identification"
for "generic film".
</description>
</entry>
<entry name="bt2020" value="6">
@ -219,7 +208,6 @@
Color primaries as defined by
- Rec. ITU-R BT.2020-2
- Rec. ITU-R BT.2100-0
Equivalent to H.273 ColourPrimaries code point 9.
</description>
</entry>
<entry name="cie1931_xyz" value="7">
@ -228,21 +216,18 @@
space by
- SMPTE ST 428-1
- (CIE 1931 XYZ as in ISO 11664-1)
Equivalent to H.273 ColourPrimaries code point 10.
</description>
</entry>
<entry name="dci_p3" value="8">
<description summary="Color primaries of the DCI P3 color space as defined by the SMPTE RP 431 standard">
Color primaries as defined by Digital Cinema System and published in
SMPTE RP 431-2 (2011). Equivalent to H.273 ColourPrimaries code point
11.
SMPTE RP 431-2 (2011).
</description>
</entry>
<entry name="display_p3" value="9">
<description summary="Color primaries of Display P3 variant of the DCI-P3 color space as defined by the SMPTE EG 432 standard">
Color primaries as defined by Digital Cinema System and published in
SMPTE EG 432-1 (2010).
Equivalent to H.273 ColourPrimaries code point 12.
</description>
</entry>
<entry name="adobe_rgb" value="10">
@ -256,13 +241,9 @@
<enum name="transfer_function">
<description summary="named transfer functions">
Named transfer functions used to represent well-known transfer
characteristics. H.273 is the authority, when it comes to the exact
formulas and authoritative specifications, where an equivalent code
point exists.
characteristics.
A value of 0 is invalid and will never be present in the list of enums.
Descriptions do list the specifications for convenience.
</description>
<entry name="bt1886" value="1">
@ -271,8 +252,6 @@
- Rec. ITU-R BT.601-7 525 and 625
- Rec. ITU-R BT.709-6
- Rec. ITU-R BT.2020-2
These recommendations are referred to by H.273 TransferCharacteristics
code points 1, 6, 14, and 15, which are all equivalent.
This TF implies these default luminances from Rec. ITU-R BT.2035:
- primary color volume minimum: 0.01 cd/m²
@ -289,7 +268,6 @@
- United States Federal Communications Commission (2003) Title 47 Code
of Federal Regulations 73.682 (a) (20)
- Rec. ITU-R BT.1700-0 625 PAL and 625 SECAM
Equivalent to H.273 TransferCharacteristics code point 4.
Note: an sRGB display (IEC 61966-2-1) uses this transfer function.
</description>
@ -298,50 +276,40 @@
<description summary="Assumed display gamma 2.8 transfer function">
Transfer characteristics as defined by
- Rec. ITU-R BT.470-6 System B, G (historical)
Equivalent to H.273 TransferCharacteristics code point 5.
</description>
</entry>
<entry name="st240" value="4">
<description summary="SMPTE ST 240 transfer function">
Transfer characteristics as defined by
- SMPTE ST 240 (1999)
Equivalent to H.273 TransferCharacteristics code point 7.
</description>
</entry>
<entry name="ext_linear" value="5">
<description summary="extended linear transfer function">
Linear transfer function defined over all real numbers.
Normalised electrical values are equal the normalised optical values.
The differences to H.273 TransferCharacteristics code point 8 are
the definition over all real numbers.
</description>
</entry>
<entry name="log_100" value="6">
<description summary="logarithmic 100:1 transfer function">
Logarithmic transfer characteristic (100:1 range).
Equivalent to H.273 TransferCharacteristics code point 9.
</description>
</entry>
<entry name="log_316" value="7">
<description summary="logarithmic (100*Sqrt(10) : 1) transfer function">
Logarithmic transfer characteristic (100 * Sqrt(10) : 1 range).
Equivalent to H.273 TransferCharacteristics code point 10.
</description>
</entry>
<entry name="xvycc" value="8">
<description summary="IEC 61966-2-4 transfer function">
Transfer characteristics as defined by
- IEC 61966-2-4
Equivalent to H.273 TransferCharacteristics code point 11.
</description>
</entry>
<entry name="srgb" value="9">
<description summary="sRGB piece-wise transfer function">
Transfer characteristics as defined by
- IEC 61966-2-1 sRGB
Equivalent to H.273 TransferCharacteristics code point 13 with
MatrixCoefficients set to 0.
Note: This is not appropriate for describing sRGB material.
sRGB material is intended to be viewed on an sRGB display, and
@ -352,8 +320,6 @@
<description summary="Extended sRGB piece-wise transfer function">
Transfer characteristics as defined by
- IEC 61966-2-1 sYCC
Equivalent to H.273 TransferCharacteristics code point 13 with
MatrixCoefficients set to anything but 0.
</description>
</entry>
<entry name="st2084_pq" value="11">
@ -361,7 +327,6 @@
Transfer characteristics as defined by
- SMPTE ST 2084 (2014) for 10-, 12-, 14- and 16-bit systems
- Rec. ITU-R BT.2100-2 perceptual quantization (PQ) system
Equivalent to H.273 TransferCharacteristics code point 16.
This TF implies these default luminances
- primary color volume minimum: 0.005 cd/m²
@ -379,7 +344,6 @@
<description summary="SMPTE ST 428 transfer function">
Transfer characteristics as defined by
- SMPTE ST 428-1 (2019)
Equivalent to H.273 TransferCharacteristics code point 17.
</description>
</entry>
<entry name="hlg" value="13">
@ -387,7 +351,6 @@
Transfer characteristics as defined by
- ARIB STD-B67 (2015)
- Rec. ITU-R BT.2100-2 hybrid log-gamma (HLG) system
Equivalent to H.273 TransferCharacteristics code point 18.
This TF implies these default luminances
- primary color volume minimum: 0.005 cd/m²