diff --git a/README.md b/README.md
index f2eab8e..e89e610 100644
--- a/README.md
+++ b/README.md
@@ -176,7 +176,7 @@ if err != nil {
 
 options := bimg.Watermark{
   Watermark{
-    Text:       "Chuck Norris - Copyright (c) 2315",
+    Text:       "Chuck Norris (c) 2315",
     Opacity:    0.25,
     Width:      200,
     DPI:        100,
diff --git a/image.go b/image.go
index f32606e..fe0d777 100644
--- a/image.go
+++ b/image.go
@@ -75,7 +75,7 @@ func (i *Image) Thumbnail(pixels int) ([]byte, error) {
 	return i.Process(options)
 }
 
-// Insert an image to the existent one as watermark
+// Add text as watermark on the given image
 func (i *Image) Watermark(w Watermark) ([]byte, error) {
 	options := Options{Watermark: w}
 	return i.Process(options)
diff --git a/resize_test.go b/resize_test.go
index 97b91bf..0c29dd6 100644
--- a/resize_test.go
+++ b/resize_test.go
@@ -209,7 +209,7 @@ func BenchmarkConvertToJpeg(b *testing.B) {
 	runBenchmarkResize("test.png", options, b)
 }
 
-func BenchmarkCrop(b *testing.B) {
+func BenchmarkCropJpeg(b *testing.B) {
 	options := Options{
 		Width:  800,
 		Height: 600,
@@ -217,6 +217,22 @@ func BenchmarkCrop(b *testing.B) {
 	runBenchmarkResize("test.jpg", options, b)
 }
 
+func BenchmarkCropPng(b *testing.B) {
+	options := Options{
+		Width:  800,
+		Height: 600,
+	}
+	runBenchmarkResize("test.png", options, b)
+}
+
+func BenchmarkCropWebP(b *testing.B) {
+	options := Options{
+		Width:  800,
+		Height: 600,
+	}
+	runBenchmarkResize("test.webp", options, b)
+}
+
 func BenchmarkExtractJpeg(b *testing.B) {
 	options := Options{
 		Top:        100,
@@ -226,3 +242,83 @@ func BenchmarkExtractJpeg(b *testing.B) {
 	}
 	runBenchmarkResize("test.jpg", options, b)
 }
+
+func BenchmarkExtractPng(b *testing.B) {
+	options := Options{
+		Top:        100,
+		Left:       50,
+		AreaWidth:  600,
+		AreaHeight: 480,
+	}
+	runBenchmarkResize("test.png", options, b)
+}
+
+func BenchmarkExtractWebp(b *testing.B) {
+	options := Options{
+		Top:        100,
+		Left:       50,
+		AreaWidth:  600,
+		AreaHeight: 480,
+	}
+	runBenchmarkResize("test.webp", options, b)
+}
+
+func BenchmarkZoomJpeg(b *testing.B) {
+	options := Options{Zoom: 1}
+	runBenchmarkResize("test.jpg", options, b)
+}
+
+func BenchmarkZoomPng(b *testing.B) {
+	options := Options{Zoom: 1}
+	runBenchmarkResize("test.png", options, b)
+}
+
+func BenchmarkZoomWebp(b *testing.B) {
+	options := Options{Zoom: 1}
+	runBenchmarkResize("test.webp", options, b)
+}
+
+func BenchmarkWatermarkJpeg(b *testing.B) {
+	options := Options{
+		Watermark: Watermark{
+			Text:       "Chuck Norris (c) 2315",
+			Opacity:    0.25,
+			Width:      200,
+			DPI:        100,
+			Margin:     150,
+			Font:       "sans bold 12",
+			Background: Color{255, 255, 255},
+		},
+	}
+	runBenchmarkResize("test.webp", options, b)
+}
+
+func BenchmarkWatermarPng(b *testing.B) {
+	options := Options{
+		Watermark: Watermark{
+			Text:       "Chuck Norris (c) 2315",
+			Opacity:    0.25,
+			Width:      200,
+			DPI:        100,
+			Margin:     150,
+			Font:       "sans bold 12",
+			Background: Color{255, 255, 255},
+		},
+	}
+	runBenchmarkResize("test.png", options, b)
+}
+
+func BenchmarkWatermarWebp(b *testing.B) {
+	options := Options{
+		Watermark: Watermark{
+			Text:       "Chuck Norris (c) 2315",
+			Opacity:    0.25,
+			Width:      200,
+			DPI:        100,
+			Margin:     150,
+			Font:       "sans bold 12",
+			Background: Color{255, 255, 255},
+		},
+	}
+	runBenchmarkResize("test.webp", options, b)
+}
diff --git a/vips.h b/vips.h
index 0fa7cf9..bdec6b9 100644
--- a/vips.h
+++ b/vips.h
@@ -17,11 +17,11 @@ typedef struct {
 } watermarkTextOptions;
 
 typedef struct {
-	int Width;
-	int DPI;
-	int Margin;
-	int NoReplicate;
-	float Opacity;
+	int    Width;
+	int    DPI;
+	int    Margin;
+	int    NoReplicate;
+	float  Opacity;
 	double Background[3];
 } watermarkOptions;