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Correct the sRGB EOTF gamma in the HDR compositing example (Annex Q.1) #1072

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May 29, 2019
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Correct the sRGB EOTF gamma in the HDR compositing example (Annex Q.1) #1072

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Change the sRGB EOTF gamma to 2.2 in the Perceptual Quantizer appendi…
palemieux May 2, 2019
fb7b5ed
Address https://github.com/w3c/ttml2/pull/1072#pullrequestreview-2357…
palemieux May 13, 2019
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8 changes: 6 additions & 2 deletions spec/ttml2.xml
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Expand Up @@ -28967,6 +28967,10 @@ application based on <bibref ref="html52"/>), rather than of the Document Instan
The following illustrates the use of <loc href="#style-attribute-luminanceGain"><att>tts:luminanceGain</att></loc> to composite <bibref ref="srgb"/> pixels onto HDR pixels
that conform to the system colorimetry specified in <bibref ref="bt2100_1"/> using perceptual quantizer (PQ) EOTF and full-range quantization.
</p>
<note role="elaboration">
<p>The following example is not intended to provide generic color management and be applicable to all situations, e.g. it assumes the target compositing
surface is 10-bit and uses full-range quantization.</p>
</note>
<olist>
<item>
<p>
Expand All @@ -28987,9 +28991,9 @@ Invert the 8-bit full-range quantization:
</item>
<item>
<p>
Linearize using the <bibref ref="srgb"/> EOTF:
Linearize using the <bibref ref="srgb"/> reference display EOTF:
</p><p>
<code>(r<sup>2.4</sup>, g<sup>2.4</sup>, b<sup>2.4</sup>) → (r, g, b)</code>
<code>(r<sup>2.2</sup>, g<sup>2.2</sup>, b<sup>2.2</sup>) → (r, g, b)</code>
</p>
</item>
<item>
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