add minimum size to process option

README.md

@@ -1,8 +1,7 @@
 # imageoptimizer
 
 imageoptimizer is a tool for bulk compression og JPG images. It will re-compress original images and replace them if the savings is
-more than the requested percentage difference, default is 25%. By defaul it operated in a "dry run" mode where images are not replaced
-but individual and total savings are reported at the end, unless you supply the '-replace' flag.
+more than the requested percentage difference and optionally if the original file is bigger than a cefrtain size. By default it operates in a "dry run" mode where images are not replaced but individual and total savings are reported at the end, unless you supply the '-replace' flag.
 
 # why?
 

main.go

@@ -17,6 +17,8 @@ type config struct {
 	Replace       bool
 	StartingPath  string
 	Quiet bool
+		AtLeast	uint
+
 }
 
 type stats struct {
@@ -33,6 +35,7 @@ func main() {
 	flag.UintVar(&c.Diff, "diff", 25, "Percent difference required to replace original image.")
 	flag.UintVar(&c.Quality, "quality", 85, "JPG compression quality level.")
 	flag.BoolVar(&c.Quiet, "quiet", false, "Less output - don't print per-file detail")
+	flag.UintVar(&c.AtLeast, "atleast", 0, "Ignore images that aren't at least this many kilobytes")
 	flag.StringVar(&c.StartingPath, "startingpath", ".", "Start from this path instead of current working dir")
 	flag.BoolVar(&c.Replace, "replace", false, "Replace with compressed versions if criteria are met. Otheriwse, just test and report, don't replace any images. (default false)")
 	flag.Parse()
@@ -102,6 +105,13 @@ func doSingleImage(f string, c config, s stats) stats {
 		fmt.Printf("Error reading file %s: %s\n", f, err.Error())
 		return s
 	}
+	if st.Size() < int64(c.AtLeast) {
+			s.StartingBytes += uint64(st.Size())
+			if !c.Quiet {
+				fmt.Printf("Ignoring %s as %d bytes are below threashold", f, st.Size())
+			}
+			return s
+	}
 	in, err := os.Open(f)
 	if err != nil {
 		fmt.Printf("Error opening file %s: %s\n", f, err.Error())