Fix reverse HLG transform

benjamin-otte · svgeesus · commit 5ea4a279782c · 2024-07-25T20:31:42.000+03:00
The +b needs to happen outside of the exp() call to be the reverse of the original HLG.
diff --git a/css-color-hdr/Overview.bs b/css-color-hdr/Overview.bs
@@ -578,7 +578,7 @@ Predefined color spaces for HDR: {#predefined-HDR}
 			E = (Edash ** 2) / 3;
 		}
 		else {
-			E = Math.exp(((Edash - c) / a) + b) / 12;
+			E = (Math.exp((Edash - c) / a) + b) / 12;
 		}
 	</pre>
 

Original file line number	Diff line number	Diff line change
`@@ -578,7 +578,7 @@ Predefined color spaces for HDR: {#predefined-HDR}`
`578`	`578`	`E = (Edash ** 2) / 3;`
`579`	`579`	`}`
`580`	`580`	`else {`
`581`		`- E = Math.exp(((Edash - c) / a) + b) / 12;`
	`581`	`+ E = (Math.exp((Edash - c) / a) + b) / 12;`
`582`	`582`	`}`
`583`	`583`	`</pre>`
`584`	`584`