automated snapshot

utils.go

@@ -21,4 +21,10 @@ func GrayCurve(v, k float32) rl.Color {
 	return rl.Color{R: c, G: c, B: c, A: 255}
 }
 
+func Brightness(c rl.Color) float32 {
+	r := float32(c.R) / 255
+	g := float32(c.G) / 255
+	b := float32(c.B) / 255
+	return 0.2126*r + 0.7152*g + 0.0722*b
+}