[css-color-hdr] Clarify allowed percentages

Author: svgeesus

css-color-hdr/Overview.bs

@@ -7,7 +7,7 @@ Group: csswg
 TR: https://www.w3.org/TR/css-color-hdr/
 ED: https://drafts.csswg.org/css-color-hdr/
 Work Status: exploring
-Editor: Chris Lilley, W3C, chris@w3.org, w3cid 1438
+Editor: Chris Lilley, W3C, https://svgees.us/, w3cid 1438
 Abstract: This module explores additions to CSS Color 4 to enable High Dynamic Range (HDR).
 </pre>
 
@@ -153,6 +153,10 @@ Predefined color spaces for HDR: {#predefined-HDR}
 		<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>
+		<tr>
+			<th>Percentages</th>
+			<td  colspan="2">Allowed for R, G and B</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."
@@ -258,6 +262,10 @@ Predefined color spaces for HDR: {#predefined-HDR}
 		<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>
+		<tr>
+			<th>Percentages</th>
+			<td  colspan="2">Allowed for R, G and B</td>
+		</tr>
 	</table>
 
 	Issue: add other examples
@@ -329,10 +337,11 @@ Predefined color spaces for HDR: {#predefined-HDR}
 	redness-greenness and yellowness-blueness
 	opponent-color axes (similar to a and b in Lab).
 
-	Lab uses a lightness scale with a [0%, 100%] range,
+	CIE Lab uses a lightness scale with a [0%, 100%] range,
 	relative to media white,
 	and has been experimentally extended to L=400%.
-	In contrast, the J<sub>z</sub> axis in ''Jzazbz''
+	In contrast, the J<sub>z</sub> axis in ''Jzazbz'',
+	which has a [0, 1.0] range,
 	uses Perceptual Quantizer encoding,
 	and can represent a dynamic range of more than 13 stops.
 
@@ -345,6 +354,10 @@ Predefined color spaces for HDR: {#predefined-HDR}
 		<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>
+		<tr>
+			<th>Percentages</th>
+			<td  colspan="2">Allowed for Jz, az and bz</td>
+		</tr>
 	</table>
 
 	Note that unlike Lab, a D65 whitepoint is used.
@@ -430,6 +443,10 @@ Converting JzCzHz colors to Jzazbz  colors</h4>
 		<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>
+		<tr>
+			<th>Percentages</th>
+			<td  colspan="2">Allowed for I, Ct and Cp</td>
+		</tr>
 	</table>
 
 	Although [[Rec_BT.2100]] defines IC<sub>T</sub>C<sub>P</sub>