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Remove "value" from sato definition (#255)
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SHA: 1b5720e
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</style>
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<p>In these sections, a "sample" refers to the value of a pixel for a given channel.</p>
<p>With a Sample Transform Derived Image Item, pixels at the same position in multiple input image items can be combined into a single output pixel using basic mathematical operations. This makes it possible for <a data-link-type="dfn" href="#avif-image-brand-avif" id="ref-for-avif-image-brand-avif①">AVIF</a> to support 16 or more bits of precision per sample, while still offering backward compatibility through a regular 8 to 12-bit <a data-link-type="dfn" href="#av1-image-item" id="ref-for-av1-image-item①⑦">AV1 Image Item</a> containing the most significant bits of each sample.</p>
<h5 class="heading settled" data-level="4.2.2.1" id="sample-transform-definition"><span class="secno">4.2.2.1. </span><span class="content">Definition</span><a class="self-link" href="#sample-transform-definition"></a></h5>
<p>When a <a data-link-type="dfn" href="https://www.iso.org/standard/66067.html" id="ref-for-something①⓪⑦">derived image item</a> is of type <dfn class="css" data-dfn-for="Sample Transform Derived Image Item Type" data-dfn-type="value" data-export id="valdef-sample-transform-derived-image-item-type-sato">sato<a class="self-link" href="#valdef-sample-transform-derived-image-item-type-sato"></a></dfn>, it is called a <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="sample-transform-derived-image-item">Sample Transform Derived Image Item</dfn>, and its reconstructed image is formed from a set of input image items, <a data-link-type="dfn" href="#sato-constant" id="ref-for-sato-constant">constants</a> and <a data-link-type="dfn" href="#sato-operator" id="ref-for-sato-operator">operators</a>.</p>
<p>When a <a data-link-type="dfn" href="https://www.iso.org/standard/66067.html" id="ref-for-something①⓪⑦">derived image item</a> is of type <dfn data-dfn-for="Sample Transform Derived Image Item Type" data-dfn-type="dfn" data-export id="sample-transform-derived-image-item-type-sato">sato<a class="self-link" href="#sample-transform-derived-image-item-type-sato"></a></dfn>, it is called a <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="sample-transform-derived-image-item">Sample Transform Derived Image Item</dfn>, and its reconstructed image is formed from a set of input image items, <a data-link-type="dfn" href="#sato-constant" id="ref-for-sato-constant">constants</a> and <a data-link-type="dfn" href="#sato-operator" id="ref-for-sato-operator">operators</a>.</p>
<p>The input images are specified in the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68960.html" id="ref-for-something①⓪⑧">SingleItemTypeReferenceBox</a></code> or <code><a data-link-type="dfn" href="https://www.iso.org/standard/68960.html" id="ref-for-something①⓪⑨">SingleItemTypeReferenceBoxLarge</a></code> entries of type <code>'<a data-link-type="dfn" href="https://www.iso.org/standard/66067.html" id="ref-for-something①①⓪">dimg</a>'</code> for this <a data-link-type="dfn" href="#sample-transform-derived-image-item" id="ref-for-sample-transform-derived-image-item">Sample Transform Derived Image Item</a> within the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68960.html" id="ref-for-something①①①">ItemReferenceBox</a></code>. The input images are in the same order as specified in these entries. In the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68960.html" id="ref-for-something①①②">SingleItemTypeReferenceBox</a></code> or <code><a data-link-type="dfn" href="https://www.iso.org/standard/68960.html" id="ref-for-something①①③">SingleItemTypeReferenceBoxLarge</a></code> of type <code>'<a data-link-type="dfn" href="https://www.iso.org/standard/66067.html" id="ref-for-something①①④">dimg</a>'</code>, the value of the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68960.html" id="ref-for-something①①⑤">from_item_ID</a></code> field identifies the <a data-link-type="dfn" href="#sample-transform-derived-image-item" id="ref-for-sample-transform-derived-image-item①">Sample Transform Derived Image Item</a>, and the values of the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68960.html" id="ref-for-something①①⑥">to_item_ID</a></code> field identify the input images. There are <code><a data-link-type="dfn" href="https://www.iso.org/standard/68960.html" id="ref-for-something①①⑦">reference_count</a></code> input image items as specified by the <code><a data-link-type="dfn" href="https://www.iso.org/standard/68960.html" id="ref-for-something①①⑧">ItemReferenceBox</a></code>.</p>
<p>The input image items and the <a data-link-type="dfn" href="#sample-transform-derived-image-item" id="ref-for-sample-transform-derived-image-item②">Sample Transform Derived Image Item</a> shall:</p>
<ul>
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<li><a href="#op_index">op_index</a><span>, in § 2.3.2.1.4</span>
<li><a href="#sato-reserved">reserved</a><span>, in § 4.2.2.3</span>
<li><a href="#sample-transform-derived-image-item">Sample Transform Derived Image Item</a><span>, in § 4.2.2.1</span>
<li><a href="#valdef-sample-transform-derived-image-item-type-sato">sato</a><span>, in § 4.2.2.1</span>
<li><a href="#sample-transform-derived-image-item-type-sato">sato</a><span>, in § 4.2.2.1</span>
<li><a href="#avif-ster">ster</a><span>, in § 5.2</span>
<li><a href="#sato-token">token</a><span>, in § 4.2.2.3</span>
<li><a href="#sato-token_count">token_count</a><span>, in § 4.2.2.3</span>
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