tweaks

Author: svgeesus

css-color-hdr/Overview.bs

@@ -122,18 +122,18 @@ Predefined colorspaces for HDR: {#predefined-HDR}
 
 	Issue: should the range be in absolute nits, ie [0.0, 10,000]? Probably not.
 
-	Issue: should th values acept % as wel as number? so 19% as well as 0.19.
+	Issue: should the values accept % as well as number? so 19% as well as 0.19.
 
 	The Perceptual Quantizer (PQ) electro-optical transfer function is used
 	[[SMPTE-ST-2084]],[[!Rec.2100]].
 	PQ assumes a reference viewing condition
-	where the scren surround
-	is at 5  cd/m².
+	where the screen surround
+	is at 5 cd/m².
 
 	ITU Reference 2100 is used for HDR 4k and 8k television.
 
 	In contrast to SDR colorspaces and some HDR colorspaces,
-	the values are <em>absolute</em> rather than relative.
+	the PQ values are <em>absolute</em> rather than relative.
 
 	Issue: add a diagram showing SDR and HDR dynamic ranges on a log scale
 
@@ -147,7 +147,7 @@ Predefined colorspaces for HDR: {#predefined-HDR}
 		<tr><th>Blue chromaticity</th><td>0.131</td><td>0.046</td></tr>
 		<tr><th>White chromaticity</th><td>0.3127</td><td>0.3290</td></tr>
 		<tr><th>Transfer function</th><td colspan="2">Perceptual Quantizer</td></tr>
-		<tr><th>White luminance</th></tr><td colspan="2">140 cd/m² [[!Dolby-PQ-levels]]</td></tr>
+		<tr><th>White luminance</th><td colspan="2">140 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>
 	</table>
@@ -186,7 +186,7 @@ Predefined colorspaces for HDR: {#predefined-HDR}
 
 	Issue: add other examples, including encoding of sRGB red, green, blue and P3 red, green, blue.
 
-	Linear-light RGB signals are converted to PQ encoded as follows. An absolute luminance scale is used, so the luminance of diffuse (media) white is required to scale relative luminances. The maximum encodable value (peak, small-area white) in PQ is 10,000 cd/m²:
+	Linear-light RGB signals are converted to PQ encoded as follows. An absolute luminance scale is used, so the luminance of diffuse (media) white is required to scale relative luminances. The maximum encodable value (peak, small-area white) in PQ is 10,000 cd/m². Media whte is 140 cd/m² [[!Dolby-PQ-levels]].
 
 	<!-- From Froehlich p.42
 		and BT.2100 Table 4 p.4 Reference PQ OETF