From 603871d556a276371e2cadcd4b1d35e5de0bdd61 Mon Sep 17 00:00:00 2001
From: Gator <gator@ariona.fr>
Date: Mon, 2 May 2022 13:25:50 +0200
Subject: [PATCH] average blend method

---
 README.md | 18 ++++++++++++++++++
 blend.go  |  6 ++++++
 config.go |  2 +-
 3 files changed, 25 insertions(+), 1 deletion(-)
 create mode 100644 README.md

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..51d1c22
--- /dev/null
+++ b/README.md
@@ -0,0 +1,18 @@
+# Requirements
+- go >= 1.16.2
+
+# Install
+
+Just `git clone`, `cd pixelweaver` and `go build` bro
+
+# Usage
+
+See `pixelweaver -help` for all available options
+
+Example : Blends three random pictures stored in specified folder, using averaging, with a sepia filter
+`pixelweaver -amount 3 -input ~/Photos -blending average -sepia`
+
+# Resources
+- [image package documentation on pkg.go.dev](https://pkg.go.dev/image)
+- [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)
diff --git a/blend.go b/blend.go
index 723b80b..8791741 100644
--- a/blend.go
+++ b/blend.go
@@ -195,6 +195,10 @@ func filter(pixel color.Color) color.Color {
 	return pixel
 }
 
+func average(fc uint8, bc uint8, fa uint8) float64 {
+	return (float64(fc)/2 + float64(bc)/2)
+}
+
 func darken(fc uint8, bc uint8, fa uint8) float64 {
 	return math.Min(float64(fc), float64(bc))
 }
@@ -214,6 +218,8 @@ func blend(fc uint8, bc uint8, fa uint8, ba uint8) float64 {
 	switch ConfigRegister.Method {
 	case "darken":
 		newValue = darken(fc, bc, fa)
+	case "average":
+		newValue = average(fc, bc, fa)
 	case "ligten":
 		newValue = lighten(fc, bc, fa)
 	case "fuckyfun":
diff --git a/config.go b/config.go
index 895870c..0501a2c 100644
--- a/config.go
+++ b/config.go
@@ -48,7 +48,7 @@ func (c *Config) SetOutputDimensions() {
 
 func initConfigRegister() {
 	// command line arguments
-	flag.StringVar(&ConfigRegister.Method, "blending", "darken", "Blending methods : darken, lighten, fuckyfun")
+	flag.StringVar(&ConfigRegister.Method, "blending", "darken", "Blending methods : darken, lighten, average, fuckyfun")
 	flag.StringVar(&ConfigRegister.OutputDir, "output", "./", "Output directory")
 	flag.StringVar(&ConfigRegister.InputDir, "input", "/home/gator/Photos", "Input directory. Where to look the images from")
 	flag.StringVar(&ConfigRegister.BaseImage, "base-img", "", "Path to the base image to work with. Random image if not set")