multiply, typo for lighten, resources

README.md

@@ -16,6 +16,9 @@ Example : Blends three random pictures stored in specified folder, using averagi
 
 # Resources
 - [image package documentation on pkg.go.dev](https://pkg.go.dev/image)
+- [github - phrozen's blend package](https://github.com/phrozen/blend/blob/master/blend.go)
 - [Sighack - Averaging RGB Colors the Right Way](https://sighack.com/post/averaging-rgb-colors-the-right-way)
 - [Sau Sheong - Image processing with Go](https://go-recipes.dev/more-working-with-images-in-go-30b11ab2a9f0?gi=3bb0ce492e2e)
 - [Damitha Dayananda - Image Processing With GoLang](https://medium.com/@damithadayananda/image-processing-with-golang-8f20d2d243a2)
+- [Image blending using pyramid](https://compvisionlab.wordpress.com/2013/05/13/image-blending-using-pyramid/)
+- [Nancy Jo Ward | MA Digital Fine Arts - Blend Modes = Algorithms Explained](https://nancyjoward.wordpress.com/2018/04/17/blend-modes-algorithms-explained/)

blend.go

@@ -207,6 +207,10 @@ func lighten(fc uint8, bc uint8, fa uint8) float64 {
 	return math.Max(float64(fc), float64(bc))
 }
 
+func multiply(fc uint8, bc uint8, fa uint8) float64 {
+	return float64(fc) * float64(bc) / 255
+}
+
 // produce absolute garbage
 func fuckyfun(fc uint8, bc uint8, fa uint8) float64 {
 	return float64((fc * fa) + (bc * (fa * 2)))
@@ -220,8 +224,10 @@ func blend(fc uint8, bc uint8, fa uint8, ba uint8) float64 {
 		newValue = darken(fc, bc, fa)
 	case "average":
 		newValue = average(fc, bc, fa)
-	case "ligten":
+	case "lighten":
 		newValue = lighten(fc, bc, fa)
+	case "multiply":
+		newValue = multiply(fc, bc, fa)
 	case "fuckyfun":
 		newValue = fuckyfun(fc, bc, fa)
 	default: