diff --git a/weed/images/preprocess.go b/weed/images/preprocess.go
index 56f14eaa4..0cfb66c6b 100644
--- a/weed/images/preprocess.go
+++ b/weed/images/preprocess.go
@@ -3,6 +3,8 @@ package images
 import (
 	"path/filepath"
 	"strings"
+	"bytes"
+	"io"
 )
 
 /*
@@ -13,15 +15,15 @@ import (
 * Call this function on any file uploaded to SeaweedFS
 *
  */
-func MaybePreprocessImage(filename string, data []byte, width, height int) (resized []byte, w int, h int) {
+func MaybePreprocessImage(filename string, data []byte, width, height int) (resized io.ReadSeeker, w int, h int) {
 	ext := filepath.Ext(filename)
 	ext = strings.ToLower(ext)
 	switch ext {
 	case ".png", ".gif":
-		return Resized(ext, data, width, height, "")
+		return Resized(ext, bytes.NewReader(data), width, height, "")
 	case ".jpg", ".jpeg":
 		data = FixJpgOrientation(data)
-		return Resized(ext, data, width, height, "")
+		return Resized(ext, bytes.NewReader(data), width, height, "")
 	}
-	return data, 0, 0
+	return bytes.NewReader(data), 0, 0
 }
diff --git a/weed/images/resizing.go b/weed/images/resizing.go
index 0ea6b1777..ff0eff5e1 100644
--- a/weed/images/resizing.go
+++ b/weed/images/resizing.go
@@ -9,13 +9,14 @@ import (
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/disintegration/imaging"
+	"io"
 )
 
-func Resized(ext string, data []byte, width, height int, mode string) (resized []byte, w int, h int) {
+func Resized(ext string, read io.ReadSeeker, width, height int, mode string) (resized io.ReadSeeker, w int, h int) {
 	if width == 0 && height == 0 {
-		return data, 0, 0
+		return read, 0, 0
 	}
-	srcImage, _, err := image.Decode(bytes.NewReader(data))
+	srcImage, _, err := image.Decode(read)
 	if err == nil {
 		bounds := srcImage.Bounds()
 		var dstImage *image.NRGBA
@@ -34,7 +35,7 @@ func Resized(ext string, data []byte, width, height int, mode string) (resized [
 				}
 			}
 		} else {
-			return data, bounds.Dx(), bounds.Dy()
+			return read, bounds.Dx(), bounds.Dy()
 		}
 		var buf bytes.Buffer
 		switch ext {
@@ -45,9 +46,9 @@ func Resized(ext string, data []byte, width, height int, mode string) (resized [
 		case ".gif":
 			gif.Encode(&buf, dstImage, nil)
 		}
-		return buf.Bytes(), dstImage.Bounds().Dx(), dstImage.Bounds().Dy()
+		return bytes.NewReader(buf.Bytes()), dstImage.Bounds().Dx(), dstImage.Bounds().Dy()
 	} else {
 		glog.Error(err)
 	}
-	return data, 0, 0
+	return read, 0, 0
 }
diff --git a/weed/server/volume_server_handlers_read.go b/weed/server/volume_server_handlers_read.go
index b784dd60e..734291a36 100644
--- a/weed/server/volume_server_handlers_read.go
+++ b/weed/server/volume_server_handlers_read.go
@@ -135,7 +135,8 @@ func (vs *VolumeServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 			}
 		}
 	}
-	if ext == ".png" || ext == ".jpg" || ext == ".gif" {
+	var rs io.ReadSeeker
+	if ext == ".png" || ext == ".jpg" || ext == ".jpeg" || ext == ".gif" {
 		width, height := 0, 0
 		if r.FormValue("width") != "" {
 			width, _ = strconv.Atoi(r.FormValue("width"))
@@ -143,10 +144,10 @@ func (vs *VolumeServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 		if r.FormValue("height") != "" {
 			height, _ = strconv.Atoi(r.FormValue("height"))
 		}
-		n.Data, _, _ = images.Resized(ext, n.Data, width, height, r.FormValue("mode"))
+		rs, _, _ = images.Resized(ext, bytes.NewReader(n.Data), width, height, r.FormValue("mode"))
 	}
 
-	if e := writeResponseContent(filename, mtype, bytes.NewReader(n.Data), w, r); e != nil {
+	if e := writeResponseContent(filename, mtype, rs, w, r); e != nil {
 		glog.V(2).Infoln("response write error:", e)
 	}
 }
@@ -164,6 +165,9 @@ func (vs *VolumeServer) tryHandleChunkedFile(n *storage.Needle, fileName string,
 	if fileName == "" && chunkManifest.Name != "" {
 		fileName = chunkManifest.Name
 	}
+
+	ext := path.Ext(fileName)
+
 	mType := ""
 	if chunkManifest.Mime != "" {
 		mt := chunkManifest.Mime
@@ -179,7 +183,18 @@ func (vs *VolumeServer) tryHandleChunkedFile(n *storage.Needle, fileName string,
 		Master:   vs.GetMaster(),
 	}
 	defer chunkedFileReader.Close()
-	if e := writeResponseContent(fileName, mType, chunkedFileReader, w, r); e != nil {
+	var rs io.ReadSeeker
+	if ext == ".png" || ext == ".jpg" || ext == ".jpeg" || ext == ".gif" {
+		width, height := 0, 0
+		if r.FormValue("width") != "" {
+			width, _ = strconv.Atoi(r.FormValue("width"))
+		}
+		if r.FormValue("height") != "" {
+			height, _ = strconv.Atoi(r.FormValue("height"))
+		}
+		rs, _, _ = images.Resized(ext, chunkedFileReader, width, height, r.FormValue("mode"))
+	}
+	if e := writeResponseContent(fileName, mType, rs, w, r); e != nil {
 		glog.V(2).Infoln("response write error:", e)
 	}
 	return true