Merge branch 'main' into 390-add-png-dwlm-diffuse-white-luminance-met…

…adata-chunk-to-conform-to-iso-22028-5

index.html

@@ -3650,10 +3650,12 @@ <h2><span class="chunk">cICP</span> Coding-independent code points for video sig
           <pre>
 <!-- 99 73 67 80 -->63 49 43 50
 </pre>
-          <p>If present, the <span class="chunk">cICP</span> chunk specifies the colour space, transfer function, matrix
-          coefficients of the image using the code points specified in [[ITU-T-H.273]]. The video format signaling SHOULD be used
+          <p>If present, the <span class="chunk">cICP</span> chunk specifies the colour space(primaries), transfer function, matrix
+          coefficients and scaling factor of the image using the code points specified in [[ITU-T-H.273]]. The video format signaling SHOULD be used
           when processing the image, including by a decoder or when rendering the image.</p>
 
+          <p>The cICP chunk consists of four 1-byte unsigned integers to identify the characteristics described above.</p>
+
           <p>The following specifies the syntax of the <span class="chunk">cICP</span> chunk:</p>
 
           <table id="cICP-chunk-syntax" class="numbered simple">
@@ -3697,10 +3699,13 @@ <h2><span class="chunk">cICP</span> Coding-independent code points for video sig
             and RGB representations, which is not used in this International Standard since PNG images are RGB images.
           </aside>
 
-          <p>The <code>Video Full Range Flag</code> value MUST be either <code>0</code> or <code>1</code>.</p>
+          <p>The <code>Video Full Range Flag</code> value MUST be either <code>0</code> or <code>1</code>. A value of 1 specifies
+            that the content has a full range scaling. This is the usual value for RGB images. A value of 0 specifies that the 
+            content has a limited-range scaling factor</p>
 
           <aside class="note">
-            If <code>Video Full Range Flag</code> value is <code>1</code>, then the image is a <a>full-range image</a>. The vast
+            If <code>Video Full Range Flag</code> value is <code>1</code>, then the image is a <a>full-range image</a>. Typically,
+            images in the RGB color representation are stored in the full-range signal quantization, therefore the vast
             majority of computer graphics and web images, including those used in traditional PNG workflows, are <a>full-range
             images</a>. If <code>Video Full Range Flag</code> value is <code>0</code>, then the image is a <a>narrow-range
             image</a>. Narrow range images are found in video workflows where the interpretation of sample values below reference
@@ -3739,20 +3744,14 @@ <h2><span class="chunk">cICP</span> Coding-independent code points for video sig
             </li>
           </ul>
 
-          <aside class="example">
-            <span class="chunk">cICP</span> chunk field values for a common sRGB <a>full-range image</a>:
-
-            <pre>
-  1 13 0 1
-  </pre>
-          </aside>
 
           <aside class="example">
             <span class="chunk">cICP</span> chunk field values for a <a>full-range image</a> that uses the colour primaries and the
             <a>PQ</a> <a>transfer function</a> specified at [[ITU-R-BT.2100]]:
 
             <pre>
-9 16 0 1
+9 16 0 1 (Decimal)
+09 10 00 01 (Four 1-byte unsigned integers)
 </pre>
           </aside>
 
@@ -3761,7 +3760,8 @@ <h2><span class="chunk">cICP</span> Coding-independent code points for video sig
             <a>HLG</a> <a>transfer function</a> specified at [[ITU-R-BT.2100]]:
 
             <pre>
-9 18 0 1
+9 18 0 1 (Decimal values)
+09 12 00 01 (Four 1-byte unsigned integers)
 </pre>
           </aside>
 
@@ -3770,7 +3770,8 @@ <h2><span class="chunk">cICP</span> Coding-independent code points for video sig
             that uses the colour primaries and the <a>transfer function</a> defined at [[ITU-R-BT.709]]:
 
             <pre>
-1 1 0 0
+1 1 0 0 (Decimal values)
+01 01 00 00 (Four 1-byte unsigned integers)
 </pre>
           </aside>
         </section>