[css-color-hdr] Noted similarity of hdr-color to adaptive gain curves

Author: svgeesus

css-color-hdr-1/Overview.bs

@@ -572,7 +572,9 @@ Mixing Dynamic Range Limits: the ''dynamic-range-limit-mix()'' function {#dynami
 
 	<div class="informative">
 	This is a similar mechanism to gain maps, 
-	in raster images conforming to [[ISO_21496-1]].
+	in raster images conforming to [[ISO_21496-1]],
+	or to adaptive gain curves,
+	in [[SMPTE-ST-2094-50]].
 	</div>
 
 	For privacy reasons, the actual calculated color is not exposed,