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[css-color-hdr][editorial] linkfixes, prepare for fpwd
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css-color-hdr-1/Overview.bs

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Title: CSS Color HDR Module Level 1
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Shortname: css-color-hdr
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Level: 1
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Status: ED
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Status: FPWD
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Date: 2024-12-17
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Prepare for TR: yes
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Group: csswg
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TR: https://www.w3.org/TR/css-color-hdr-1/
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ED: https://drafts.csswg.org/css-color-hdr-1/
@@ -14,6 +16,23 @@ WPT Path Prefix: css/css-color-hdr/
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WPT Display: open
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</pre>
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<pre class="link-defaults">
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spec:css-cascade-5; type:dfn; text:computed value
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spec:css-color-4; type:dfn; text:color space
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spec:css-color-4; type:dfn; text:gamut
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spec:css-color-4; type:dfn; text:rectangular orthogonal color
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spec:css-color-4; type:dfn; text:cylindrical polar color
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spec:css-color-4; type:value; text:none
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spec:css-color-4; type:value; text:srgb
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spec:css-color-4; type:dfn; text:modern color syntax
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spec:css-color-4; type:value; text:alpha-value
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spec:css-color-5; type:type; text:<color>
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spec:css-color-adjust-1; type:value; text:light
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spec:css-color-adjust-1; type:value; text:dark
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spec:css-color-4; type:value; text:rec2020
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spec:css-color-4; type:dfn; text:D65
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</pre>
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<pre class=biblio>
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{
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"ARIB_STD-B67": {
@@ -264,7 +283,7 @@ The 'dynamic-range-limit' property {#the-dynamic-range-limit-property}
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Applies to: all elements
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Inherited: yes
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Percentages: n/a
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Computed value: see <a href="#computing-dynamic-range-limit">Computed Value for 'dynamic-range-limit'</a>
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Computed value: see <a href="#computing-dynamic-range-limit">Computed Value for dynamic-range-limit</a>
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Animation type: by ''dynamic-range-limit-mix()''
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Canonical order: per grammar
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</pre>
@@ -310,7 +329,7 @@ The 'dynamic-range-limit' property {#the-dynamic-range-limit-property}
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Mixing Dynamic Range Limits: the ''dynamic-range-limit-mix()'' function {#dynamic-range-limit-mix}
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--------------------------------------------------------
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This function takes two dynamic-range-limit values,
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This function takes two 'dynamic-range-limit' values,
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converts them internally to a value in stops above media white,
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and alters the display to the result of mixing them
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by the specified amount.
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<tr><th>Red chromaticity</th><td>0.708</td><td>0.292</td></tr>
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<tr><th>Green chromaticity</th><td>0.170</td><td>0.797</td></tr>
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<tr><th>Blue chromaticity</th><td>0.131</td><td>0.046</td></tr>
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<tr><th>White chromaticity</th><td colspan="2">[=D65 whitepoint|D65=]</td></tr>
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<tr><th>White chromaticity</th><td colspan="2">[=D65=]</td></tr>
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<tr><th>Transfer function</th><td colspan="2">Perceptual Quantizer</td></tr>
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<tr><th>White luminance</th><td colspan="2">203 cd/m²</td></tr>
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<tr><th>Peak white luminance</th><td colspan="2">10,000 cd/m²</td></tr>
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<tr><th>Red chromaticity</th><td>0.708</td><td>0.292</td></tr>
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<tr><th>Green chromaticity</th><td>0.170</td><td>0.797</td></tr>
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<tr><th>Blue chromaticity</th><td>0.131</td><td>0.046</td></tr>
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<tr><th>White chromaticity</th><td colspan="2">[=D65 whitepoint|D65=]</td></tr>
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<tr><th>White chromaticity</th><td colspan="2">[=D65=]</td></tr>
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<tr><th>Transfer function</th><td colspan="2">Hybrid log Gamma</td></tr>
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<tr><th>White luminance</th></tr><td colspan="2">depends on viewing conditions</td></tr>
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<tr><th>Peak white luminance</th><td colspan="2">12 times reference white</td></tr>
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<tr><th>Red chromaticity</th><td>0.708</td><td>0.292</td></tr>
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<tr><th>Green chromaticity</th><td>0.170</td><td>0.797</td></tr>
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<tr><th>Blue chromaticity</th><td>0.131</td><td>0.046</td></tr>
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<tr><th>White chromaticity</th><td colspan="2">[=D65 whitepoint|D65=]</td></tr>
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<tr><th>White chromaticity</th><td colspan="2">[=D65=]</td></tr>
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<tr><th>Transfer function</th><td colspan="2">Linear</td></tr>
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<tr><th>White luminance</th><td colspan="2">203 cd/m²</td></tr>
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<tr><th>Peak white luminance</th><td colspan="2">10,000 cd/m²</td></tr>
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<table>
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<thead><td></td><td>x</td><td>y</td></thead>
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<tr><th>White chromaticity</th><td colspan="2">[=D65 whitepoint|D65=]</td></tr>
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<tr><th>White chromaticity</th><td colspan="2">[=D65=]</td></tr>
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<tr><th>Transfer function</th><td colspan="2">Perceptual Quantizer</td></tr>
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<tr><th>Peak white luminance</th><td colspan="2">10,000 cd/m²</td></tr>
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<tr><th>Black luminance</th><td colspan="2">0.001 cd/m²</td></tr>
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</tr>
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</table>
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Note that unlike Lab, a [=D65 whitepoint=] is used.
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Note that unlike Lab, a [=D65=] whitepoint is used.
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Thus, for most RGB spaces
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(which also use a D65 whitepoint)
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no chromatic adaptation step need be performed.
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It is based on human visual system LMS cone primaries;
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the Hunt-Pointer-Estevez (HPE) XYZ to LMS transform
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is used,
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normalized to a [=D65 whitepoint=].
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normalized to a [=D65=] whitepoint.
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A crosstalk matrix is then applied,
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to reduce the gamut hull concavities of BT.2020 RGB,
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thus reducing interpolation errors.
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<table>
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<thead><td></td><td>x</td><td>y</td></thead>
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<tr><th>White chromaticity</th><td colspan="2">[=D65 whitepoint|D65=]</td></tr>
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<tr><th>White chromaticity</th><td colspan="2">[=D65=]</td></tr>
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<tr><th>Transfer function</th><td colspan="2">Perceptual Quantizer</td></tr>
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<tr><th>White luminance</th><td colspan="2">203 cd/m²</td></tr>
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<tr><th>Peak white luminance</th><td colspan="2">10,000 cd/m²</td></tr>
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and thus, any other color space can also be represented
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by applying an XYZ to LMS transform.
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Note that unlike Lab, a [=D65 whitepoint=] is used.
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Note that unlike Lab, a [=D65=] whitepoint is used.
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Also unlike Lab, which has primarily been tested with
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lower-intensity reflective colors,

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