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Harmonise references to color chunk precedence, fix #443 #444

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Apr 1, 2024
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Harmonise references to color chunk precedence, fix #443 #444

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57 changes: 22 additions & 35 deletions index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -3339,8 +3339,9 @@ <h2><span class="chunk">cHRM</span> Primary chromaticities and white point</h2>
<p>The <span class="chunk">cHRM</span> chunk is allowed in all PNG datastreams, although it is of little value for
<a>greyscale</a> images.</p>

<p>An <a class="chunk" href="#11sRGB">sRGB</a>, <a class="chunk" href="#11iCCP">iCCP</a> or <a href="#cICP-chunk" class="chunk">cICP</a> chunk, when present and
recognized, overrides the <span class="chunk">cHRM</span> chunk.</p>
<p>This chunk is ignored
unless it is the <a href="#color-chunk-precendence">highest-precedence color chunk</a>
understood by the decoder.</p>
</section>
<!-- Maintain a fragment named "11gAMA" to preserve incoming links to it -->

Expand Down Expand Up @@ -3377,8 +3378,9 @@ <h2><span class="chunk">gAMA</span> Image gamma</h2>

<p>See <a href="#12Encoder-gamma-handling"></a> and <a href="#13Decoder-gamma-handling"></a> for more information.</p>

<p>An <a class="chunk" href="#srgb-standard-colour-space">sRGB</a>, <a class="chunk" href="#11iCCP">iCCP</a> or <a href="#cICP-chunk" class="chunk">cICP</a> chunk,
when present and recognized, overrides the <span class="chunk">gAMA</span> chunk.</p>
<p>This chunk is ignored
unless it is the <a href="#color-chunk-precendence">highest-precedence color chunk</a>
understood by the decoder.</p>
</section>
<!-- Maintain a fragment named "11iCCP" to preserve incoming links to it -->

Expand Down Expand Up @@ -3428,11 +3430,13 @@ <h2><span class="chunk">iCCP</span> Embedded ICC profile</h2>
for <a>greyscale</a> images (<a>color types</a> 0 and 4). A PNG encoder that writes the <span class="chunk">iCCP</span> chunk
is encouraged to also write <a class="chunk" href="#11gAMA">gAMA</a> and <a class="chunk" href="#11cHRM">cHRM</a> chunks
that approximate the ICC profile, to provide compatibility with applications that do not use the <span class=
"chunk">iCCP</span> chunk. When the <span class="chunk">iCCP</span> chunk is present, PNG decoders that recognize it and
are capable of color management shall ignore the <a class="chunk" href="#11gAMA">gAMA</a> and <a class="chunk" href=
"#11cHRM">cHRM</a> chunks and use the <span class="chunk">iCCP</span> chunk instead and interpret it according to
[[ICC]]. PNG decoders that are used in an environment that is incapable of full-fledged color management should use the
<a class="chunk" href="#11gAMA">gAMA</a> and <a class="chunk" href="#11cHRM">cHRM</a> chunks if present.</p>
"chunk">iCCP</span> chunk.</p>

<p>
This chunk is ignored
unless it is the <a href="#color-chunk-precendence">highest-precedence color chunk</a>
understood by the decoder.
</p>

<p>Unless a <a class="chunk" href="#cICP-chunk">cICP</a> chunk exists, a PNG datastream should contain at most one
embedded profile, whether specified explicitly with an <span class="chunk">iCCP</span> or implicitly with an <a class=
Expand Down Expand Up @@ -3677,12 +3681,11 @@ <h2 id="srgb-standard-colour-space"><span class="chunk">sRGB</span> Standard RGB
</tr>
</table>

<p>When the <span class="chunk">sRGB</span> chunk is present, it is recommended that decoders that recognize it and are
capable of color management ignore the <a class="chunk" href="#11gAMA">gAMA</a> and <a class="chunk" href=
"#11cHRM">cHRM</a> chunks and use the <span class="chunk">sRGB</span> chunk instead. Decoders that recognize the
<span class="chunk">sRGB</span> chunk but are not capable of color management are recommended to ignore the <a class=
"chunk" href="#11gAMA">gAMA</a> and <a class="chunk" href="#11cHRM">cHRM</a> chunks, and use the values given above as if
they had appeared in <a class="chunk" href="#11gAMA">gAMA</a> and <a class="chunk" href="#11cHRM">cHRM</a> chunks.</p>
<p>
This chunk is ignored
unless it is the <a href="#color-chunk-precendence">highest-precedence color chunk</a>
understood by the decoder.
</p>

<p>It is recommended that the <a class="chunk" href="#11sRGB">sRGB</a> and <a class="chunk" href="#11iCCP">iCCP</a>
chunks do not appear simultaneously in a PNG datastream.</p>
Expand Down Expand Up @@ -3788,26 +3791,10 @@ <h2><span class="chunk">cICP</span> Coding-independent code points for video sig
<p>The <span class="chunk">cICP</span> chunk MUST come before the <a class="chunk" href="#11PLTE">PLTE</a> and <a class=
"chunk" href="#11IDAT">IDAT</a> chunks.</p>

<p>When the <span class="chunk">cICP</span> chunk is present, decoders that recognize it SHALL ignore the following
chunks:</p>

<ul>
<li>
<a class="chunk" href="#11iCCP">iCCP</a>
</li>

<li>
<a class="chunk" href="#11gAMA">gAMA</a>
</li>

<li>
<a class="chunk" href="#11cHRM">cHRM</a>
</li>

<li>
<a class="chunk" href="#11sRGB">sRGB</a>
</li>
</ul>
<p>
This chunk, if understood by the decoder, is the
<a href="#color-chunk-precendence">highest-precedence color chunk</a>.
</p>


<aside class="example" id="ex-cICP-BT.2100-PQ-full">
Expand Down