start ugly hack

svgeesus · svgeesus · commit 0b206bc9c61c · 2016-05-07T18:59:07.000-04:00
diff --git a/css-color/matrixmaker.html b/css-color/matrixmaker.html
@@ -0,0 +1,29 @@
+// Make matrices for converting to and from an arbitrary RGB colorspace,
+// given the x,y chromaticities of red, green, blue and white.
+// To use these matrices, the RGB components are assumed be be 
+// linearized and in the range 0 to 1.
+// http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html
+
+// Horribly hacky, non interactive utility. Edit the file to pick
+// another colorspace and read the results from the console :P
+
+<html>
+	<script src="math.js"></script>
+	<script>
+		// these are for ITU Rec BT.2020
+		const xred=0.708 ;
+		const yred=0.292 ;
+		
+		const xgreen=0.170 ;
+		const ygreen=0.797 ;
+		
+		const xblue=0.131 ;
+		const yblue=0.046 ;
+		
+		// D65
+		const xwhite=0.3127 ;
+		const ywhite=0.3290 ;
+		
+		
+	</script>
+</html>
