Moved image saving to common.

common/image.go

@@ -0,0 +1,24 @@
+// Copyright 2014 by Sascha L. Teichmann
+// Use of this source code is governed by the MIT license
+// that can be found in the LICENSE file.
+
+package common
+
+import (
+	"bufio"
+	"image"
+	"image/png"
+	"os"
+)
+
+func SaveAsPNG(path string, img image.Image) (err error) {
+	var file *os.File
+	if file, err = os.Create(path); err != nil {
+		return
+	}
+	writer := bufio.NewWriter(file)
+	err = png.Encode(writer, img)
+	writer.Flush()
+	file.Close()
+	return
+}