[css-color-hdr] Add image state, where known

Author: svgeesus

css-color-hdr/Overview.bs

@@ -150,6 +150,7 @@ Predefined colorspaces for HDR: {#predefined-HDR}
 		<tr><th>White luminance</th><td colspan="2">203 cd/m²</td></tr>
 		<tr><th>Peak white luminance</th><td colspan="2">10,000 cd/m²</td></tr>
 		<tr><th>Black luminance</th><td colspan="2">0.001 cd/m²</td></tr>
+		<tr><th>Image state</th><td colspan="2">display-referred</td></tr>
 	</table>
 
 	Issue: from BT.2100 p.3 "Note 3d – For PQ in a non-reference viewing environment, or for HLG (in any viewing environment), the black level should be adjusted using the PLUGE test signal and procedure specified in Recommendation ITU-R BT.814."
@@ -254,6 +255,7 @@ Predefined colorspaces for HDR: {#predefined-HDR}
 		<tr><th>White luminance</th></tr><td colspan="2">depends on viewing conditions</td></tr>
 		<tr><th>Peak white luminance</th><td colspan="2">12 times reference white</td></tr>
 		<tr><th>Black luminance</th><td colspan="2">depends on reference white, see text</td></tr>
+		<tr><th>Image state</th><td colspan="2">scene-referred</td></tr>
 	</table>
 
 	Issue: add other examples
@@ -340,6 +342,7 @@ Predefined colorspaces for HDR: {#predefined-HDR}
 		<tr><th>Transfer function</th><td colspan="2">Perceptual Quantizer</td></tr>
 		<tr><th>Peak white luminance</th><td colspan="2">10,000 cd/m²</td></tr>
 		<tr><th>Black luminance</th><td colspan="2">0.001 cd/m²</td></tr>
+		<!-- image state is display-referred? check paper-->
 	</table>
 
 	Note that unlike Lab, a D65 whitepoint is used.
@@ -413,6 +416,7 @@ Converting JzCzHz colors to Jzazbz  colors</h4>
 		<tr><th>White luminance</th><td colspan="2">203 cd/m²</td></tr>
 		<tr><th>Peak white luminance</th><td colspan="2">10,000 cd/m²</td></tr>
 		<tr><th>Black luminance</th><td colspan="2">0.001 cd/m²</td></tr>
+		<!-- image state is display-referred? check -->
 	</table>
 
 	Although [[Rec BT.2100]] defines IC<sub>T</sub>C<sub>P</sub>
@@ -647,4 +651,4 @@ Issue: Make some considerations about privacy and security.
 
 <h2 class="no-num" id="a11y">Accessibility Considerations</h2>
 
-Some indivduals may have a sensitivity to very bright colors, so user agents should provide a mechanism to limit the maximum luminance at user option. The toe and knee procedure in section 5.4.1 <em>Mapping to display with limited brightness range</em> of [[Rec BT.2390]] is suggested as suitable.
+Some individuals may have a sensitivity to very bright colors, so user agents should provide a mechanism to limit the maximum luminance at user option. The toe and knee procedure in section 5.4.1 <em>Mapping to display with limited brightness range</em> of [[Rec BT.2390]] is suggested as suitable.