diff --git a/icon.go b/icon.go
index 36c72fc..feb7cb1 100644
--- a/icon.go
+++ b/icon.go
@@ -42,7 +42,7 @@ func IconNN(img image.Image) IconT {
 	// Resizing to a large icon approximating average color
 	// values of the source image. YCbCr space is used instead
 	// of RGB for better results in image comparison.
-	resImg, imgSize := resizeByNearest(
+	resImg, imgSize := ResizeByNearest(
 		img, image.Point{resizedImgSize, resizedImgSize})
 	largeIcon := sizedIcon(largeIconSize)
 	var r, g, b, sumR, sumG, sumB uint32
diff --git a/image.go b/image.go
index d330399..2da8f5b 100644
--- a/image.go
+++ b/image.go
@@ -24,10 +24,10 @@ func Open(path string) (img image.Image, err error) {
 	return img, err
 }
 
-// resizeByNearest resizes an image to the destination size
+// ResizeByNearest resizes an image to the destination size
 // with the nearest neighbour method. It also returns the source
 // image size.
-func resizeByNearest(
+func ResizeByNearest(
 	src image.Image, dstSize image.Point) (
 	dst image.RGBA, srcSize image.Point) {
 	// Original image size.
diff --git a/image_test.go b/image_test.go
index 9e1e46d..b6c9009 100644
--- a/image_test.go
+++ b/image_test.go
@@ -35,7 +35,7 @@ func TestResizeByNearest(t *testing.T) {
 		if err != nil {
 			t.Error("Cannot decode", path.Join(testDir, table.outFile))
 		}
-		resampled, srcSize := resizeByNearest(inImg,
+		resampled, srcSize := ResizeByNearest(inImg,
 			image.Point{table.dstX, table.dstY})
 		if !reflect.DeepEqual(
 			outImg.(*image.RGBA), &resampled) ||