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Recommend using extended transfer functions to handle negative values #434

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merged 2 commits into from Mar 4, 2024
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Recommend using extended transfer functions to handle negative values #434

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Recommend using extended transfer functions to handle negative values…
svgeesus Mar 1, 2024
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Define EOTF and OETF
svgeesus Mar 1, 2024
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Expand Up @@ -3725,6 +3725,17 @@ <h2><span class="chunk">cICP</span> Coding-independent code points for video sig
PNG format, it should be noted that this format is not part of the [[ITU-R-BT.709]] standard.
</aside>

<p>If <code>Video Full Range Flag</code> is <code>0</code>
(a <a>narrow-range image</a>), recommended practice
is to define transfer functions
such as EOTF or inverse OETF
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The EOTF acronym doesn't seem to be defined anywhere else in the document. It would be nice to avoid introducing new terminology just to explain how to handle the Full Range flag, but at very least the terminology should be defined

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Better?

over the extended range,
so as to include negative values.
This is done as follows:
</p>

<pre>out = sign(in) * TransferFunction(abs(in))</pre>

<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>

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