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Add WCG color spaces. #566

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Oct 19, 2022
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Add WCG color spaces. #566

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60 changes: 48 additions & 12 deletions index.src.html
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Original file line number Diff line number Diff line change
Expand Up @@ -4461,9 +4461,11 @@

<xmp class='idl'>
enum VideoColorPrimaries {
"bt709", // BT.709, sRGB
"bt470bg", // BT.601 PAL
"smpte170m", // BT.601 NTSC
"bt709",
"bt470bg",
"smpte170m",
"bt2020",
"smpte432",
};
</xmp>

Expand All @@ -4483,6 +4485,16 @@
Color primaries used by BT.601 NTSC, as described by [[H.273]]
section 8.1 table 2 value 6.
</dd>
<dt><dfn enum-value for=VideoColorPrimaries>bt2020</dfn></dt>
<dd>
Color primaries used by BT.2020 and BT.2100, as described by [[H.273]]
section 8.1 table 2 value 9.
</dd>
<dt><dfn enum-value for=VideoColorPrimaries>smpte432</dfn></dt>
<dd>
Color primaries used by P3 D65, as described by [[H.273]]
section 8.1 table 2 value 12.
</dd>
</dl>

Video Transfer Characteristics {#videotransfercharacteristics}
Expand All @@ -4492,9 +4504,12 @@

<xmp class='idl'>
enum VideoTransferCharacteristics {
"bt709", // BT.709
"smpte170m", // BT.601 (functionally the same as bt709)
"iec61966-2-1", // sRGB
"bt709",
"smpte170m",
"iec61966-2-1",
"linear",
"pq",
"hlg",
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The alternative names here are "smpte2084" and "arib-std-b67", which would align with FFmpeg naming.

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Looks OK as is, but if you're considering changing, I'd suggest referencing BT2100, so something like bt2100-2-pq and bt2100-2-hlg.

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Is that more legible? Even Wikipedia just calls it PQ/HLG.

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@chrisn chrisn Oct 19, 2022 •
edited
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To clarify, my preference is for pq and hlg

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Ah great :) I think Dan was just playing devils advocate above.

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I see! My comment was really: if you're going in that direction, prefer BT.2100 rather than the SMPTE and ARIB standards.

};
</xmp>

Expand All @@ -4507,13 +4522,28 @@
<dt><dfn enum-value for=VideoTransferCharacteristics>smpte170m</dfn></dt>
<dd>
Transfer characteristics used by BT.601, as described by [[H.273]]
section 8.2 table 3 value 6.
section 8.2 table 3 value 6. (Functionally the same as "bt709".)
</dd>
<dt><dfn enum-value for=VideoTransferCharacteristics>iec61966-2-1</dfn></dt>
<dd>
Transfer characteristics used by sRGB, as described by [[H.273]]
section 8.2 table 3 value 13.
</dd>
<dt><dfn enum-value for=VideoTransferCharacteristics>linear</dfn></dt>
<dd>
Transfer characteristics used by linear RGB, as described by [[H.273]]
section 8.2 table 3 value 8.
</dd>
<dt><dfn enum-value for=VideoTransferCharacteristics>pq</dfn></dt>
<dd>
Transfer characteristics used by BT.2100 PQ, as described by [[H.273]]
section 8.2 table 3 value 16.
</dd>
<dt><dfn enum-value for=VideoTransferCharacteristics>hlg</dfn></dt>
<dd>
Transfer characteristics used by BT.2100 HLG, as described by [[H.273]]
section 8.2 table 3 value 18.
</dd>
</dl>

Video Matrix Coefficients {#videomatrixcoefficients}
Expand All @@ -4523,10 +4553,11 @@

<xmp class='idl'>
enum VideoMatrixCoefficients {
"rgb", // sRGB
"bt709", // BT.709
"bt470bg", // BT.601 PAL
"smpte170m", // BT.601 NTSC (functionally the same as bt470bg)
"rgb",
"bt709",
"bt470bg",
"smpte170m",
"bt2020-ncl",
};
</xmp>

Expand All @@ -4549,7 +4580,12 @@
<dt><dfn enum-value for=VideoMatrixCoefficients>smpte170m</dfn></dt>
<dd>
Matrix coefficients used by BT.601 NTSC, as described by [[H.273]]
section 8.3 table 4 value 6.
section 8.3 table 4 value 6. (Functionally the same as "bt470bg".)
</dd>
<dt><dfn enum-value for=VideoMatrixCoefficients>bt2020-ncl</dfn></dt>
<dd>
Matrix coefficients used by BT.2020 NCL, as described by [[H.273]]
section 8.3 table 4 value 9.
</dd>
</dl>

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