Add JPEG encoder

bin/stitch/export-jpeg.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"image/jpeg"
+	"log"
+	"os"
+)
+
+func exportJPEG(stitchedImage *StitchedImage) error {
+	log.Printf("Creating output file %q.", *flagOutputPath)
+	f, err := os.Create(*flagOutputPath)
+	if err != nil {
+		log.Panic(err)
+	}
+	defer f.Close()
+
+	options := &jpeg.Options{
+		Quality: 80,
+	}
+
+	if err := jpeg.Encode(f, stitchedImage, options); err != nil {
+		log.Panic(err)
+	}
+
+	return nil
+}

bin/stitch/main.go

@@ -270,6 +270,8 @@ func main() {
 	switch fileExtension {
 	case ".png":
 		exportPNG(stitchedImage)
+	case ".jpg", ".jpeg":
+		exportJPEG(stitchedImage)
 	default:
 		log.Panicf("Unknown output format %q.", fileExtension)
 	}