initial commit

convert.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"fmt"
+	"golang.org/x/image/tiff"
+	"image"
+	"image/color"
+	_ "image/jpeg"
+	"os"
+)
+
+func convert(i image.Image) image.Image {
+	rect := i.Bounds()
+	n := image.NewGray(rect)
+	for x := 0; x < rect.Max.X; x++ {
+		for y := 0; y < rect.Max.Y; y++ {
+			p := color.GrayModel.Convert(i.At(x, y)).(color.Gray)
+			if p.Y <= 130 {
+				n.Set(x, y, p)
+			} else {
+				n.Set(x, y, color.White)
+			}
+		}
+	}
+	return n
+}
+
+func main() {
+	in, err := os.Open(os.Args[1])
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	out, err := os.OpenFile(os.Args[2], os.O_RDWR|os.O_CREATE, 0644)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	i, _, err := image.Decode(in)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	err = tiff.Encode(out, convert(i), &tiff.Options{tiff.Uncompressed, false})
+	if err != nil {
+		fmt.Println(err)
+	}
+}