diff --git a/.travis.yml b/.travis.yml
index fa62cfc..1605932 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,28 +4,26 @@ dist: trusty
 sudo: false
 
 go:
-  # - "1.10"
-  #- "1.11"
   - "1.12"
   - "1.13"
-  # - "tip"
+	- "1.14"
 
 env:
-  # - LIBVIPS=7.42.3
-  # - LIBVIPS=8.2.3
+  - LIBVIPS=7.42.3
   # - LIBVIPS=8.3.3
-  # - LIBVIPS=8.4.6
-  # - LIBVIPS=8.5.8
+  - LIBVIPS=8.4.6
+  - LIBVIPS=8.5.8
   - LIBVIPS=8.6.2
+	- LIBVIPS=8.7.4
   - LIBVIPS=8.8.4
-  - LIBVIPS=8.9.1
+  - LIBVIPS=8.9.2
   - LIBVIPS=master
 
 matrix:
   allow_failures:
-    - env: LIBVIPS=7.42.3
-    - env: LIBVIPS=8.2.3
-    - env: LIBVIPS=8.3.3
+		- env: LIBVIPS=7.42.3
+	  - env: LIBVIPS=8.4.6
+    - env: LIBVIPS=master
 
 cache:
   apt:
diff --git a/resizer.go b/resizer.go
index a76944f..d6e2cb3 100644
--- a/resizer.go
+++ b/resizer.go
@@ -383,7 +383,7 @@ func watermarkImageWithAnotherImage(image *C.VipsImage, w WatermarkImage) (*C.Vi
 
 func imageFlatten(image *C.VipsImage, imageType ImageType, o Options) (*C.VipsImage, error) {
 	// Only PNG images are supported for now
-	if imageType != PNG || o.Background == ColorBlack {
+	if o.Background == ColorBlack || (imageType != PNG && imageType != HEIF && imageType != WEBP) {
 		return image, nil
 	}
 	return vipsFlattenBackground(image, o.Background)
diff --git a/resizer_test.go b/resizer_test.go
index 6a116a2..4b2d4a1 100644
--- a/resizer_test.go
+++ b/resizer_test.go
@@ -40,7 +40,7 @@ func TestResizeVerticalImage(t *testing.T) {
 		{Width: 1000, Height: 1500},
 		{Width: 1000},
 		{Height: 1500},
-		{Width: 100, Height: 50},
+		{Width: 200, Height: 120},
 		{Width: 2000, Height: 2000},
 		{Width: 500, Height: 1000},
 		{Width: 500},
@@ -72,7 +72,7 @@ func TestResizeVerticalImage(t *testing.T) {
 		for _, options := range tests {
 			image, err := Resize(source.buf, options)
 			if err != nil {
-				t.Errorf("Resize(imgData, %#v) error: %#v", options, err)
+				t.Fatalf("Resize(imgData, %#v) error: %#v", options, err)
 			}
 
 			format := DetermineImageType(image)
diff --git a/testdata/exif/Landscape_1_out.jpg b/testdata/exif/Landscape_1_out.jpg
index 1ffcaaf..0f7ca1f 100644
Binary files a/testdata/exif/Landscape_1_out.jpg and b/testdata/exif/Landscape_1_out.jpg differ
diff --git a/testdata/exif/Landscape_2_out.jpg b/testdata/exif/Landscape_2_out.jpg
index aab8a2a..7f71884 100644
Binary files a/testdata/exif/Landscape_2_out.jpg and b/testdata/exif/Landscape_2_out.jpg differ
diff --git a/testdata/exif/Landscape_3_out.jpg b/testdata/exif/Landscape_3_out.jpg
index a7132c7..c487686 100644
Binary files a/testdata/exif/Landscape_3_out.jpg and b/testdata/exif/Landscape_3_out.jpg differ
diff --git a/testdata/exif/Landscape_4_out.jpg b/testdata/exif/Landscape_4_out.jpg
index 95b8ea9..39533f6 100644
Binary files a/testdata/exif/Landscape_4_out.jpg and b/testdata/exif/Landscape_4_out.jpg differ
diff --git a/testdata/exif/Landscape_5_out.jpg b/testdata/exif/Landscape_5_out.jpg
index 5227db8..2edad25 100644
Binary files a/testdata/exif/Landscape_5_out.jpg and b/testdata/exif/Landscape_5_out.jpg differ
diff --git a/testdata/exif/Landscape_6_out.jpg b/testdata/exif/Landscape_6_out.jpg
index ea031f7..7e8044f 100644
Binary files a/testdata/exif/Landscape_6_out.jpg and b/testdata/exif/Landscape_6_out.jpg differ
diff --git a/testdata/exif/Landscape_7_out.jpg b/testdata/exif/Landscape_7_out.jpg
index 0e6350b..0bb5462 100644
Binary files a/testdata/exif/Landscape_7_out.jpg and b/testdata/exif/Landscape_7_out.jpg differ
diff --git a/testdata/exif/Landscape_8_out.jpg b/testdata/exif/Landscape_8_out.jpg
index 04f6b2c..995f310 100644
Binary files a/testdata/exif/Landscape_8_out.jpg and b/testdata/exif/Landscape_8_out.jpg differ
diff --git a/testdata/exif/Portrait_1_out.jpg b/testdata/exif/Portrait_1_out.jpg
index e3af98c..4c46526 100644
Binary files a/testdata/exif/Portrait_1_out.jpg and b/testdata/exif/Portrait_1_out.jpg differ
diff --git a/testdata/exif/Portrait_2_out.jpg b/testdata/exif/Portrait_2_out.jpg
index 5c5366f..0c68143 100644
Binary files a/testdata/exif/Portrait_2_out.jpg and b/testdata/exif/Portrait_2_out.jpg differ
diff --git a/testdata/exif/Portrait_3_out.jpg b/testdata/exif/Portrait_3_out.jpg
index 8a8da00..55e44ca 100644
Binary files a/testdata/exif/Portrait_3_out.jpg and b/testdata/exif/Portrait_3_out.jpg differ
diff --git a/testdata/exif/Portrait_4_out.jpg b/testdata/exif/Portrait_4_out.jpg
index 2528749..23eae85 100644
Binary files a/testdata/exif/Portrait_4_out.jpg and b/testdata/exif/Portrait_4_out.jpg differ
diff --git a/testdata/exif/Portrait_5_out.jpg b/testdata/exif/Portrait_5_out.jpg
index c2b2ff3..51ca714 100644
Binary files a/testdata/exif/Portrait_5_out.jpg and b/testdata/exif/Portrait_5_out.jpg differ
diff --git a/testdata/exif/Portrait_6_out.jpg b/testdata/exif/Portrait_6_out.jpg
index a13b3f1..867eda8 100644
Binary files a/testdata/exif/Portrait_6_out.jpg and b/testdata/exif/Portrait_6_out.jpg differ
diff --git a/testdata/exif/Portrait_7_out.jpg b/testdata/exif/Portrait_7_out.jpg
index e64cc8d..e9d4989 100644
Binary files a/testdata/exif/Portrait_7_out.jpg and b/testdata/exif/Portrait_7_out.jpg differ
diff --git a/testdata/exif/Portrait_8_out.jpg b/testdata/exif/Portrait_8_out.jpg
index ffe52aa..71c42ab 100644
Binary files a/testdata/exif/Portrait_8_out.jpg and b/testdata/exif/Portrait_8_out.jpg differ
diff --git a/testdata/test_gif.jpg b/testdata/test_gif.jpg
index d2ae362..1e8c2aa 100644
Binary files a/testdata/test_gif.jpg and b/testdata/test_gif.jpg differ
diff --git a/testdata/test_pdf.jpg b/testdata/test_pdf.jpg
index f80af8b..7a1ba3c 100644
Binary files a/testdata/test_pdf.jpg and b/testdata/test_pdf.jpg differ
diff --git a/testdata/test_smart_crop.jpg b/testdata/test_smart_crop.jpg
index 5acb94a..f5d928b 100644
Binary files a/testdata/test_smart_crop.jpg and b/testdata/test_smart_crop.jpg differ
diff --git a/testdata/test_svg.jpg b/testdata/test_svg.jpg
index dba7747..a8a1b40 100644
Binary files a/testdata/test_svg.jpg and b/testdata/test_svg.jpg differ
diff --git a/type_test.go b/type_test.go
index f3ee219..b06e251 100644
--- a/type_test.go
+++ b/type_test.go
@@ -18,7 +18,7 @@ func TestDeterminateImageType(t *testing.T) {
 		{"test.gif", GIF},
 		{"test.pdf", PDF},
 		{"test.svg", SVG},
-		{"test.jp2", MAGICK},
+		// {"test.jp2", MAGICK},
 		{"test.heic", HEIF},
 		{"test2.heic", HEIF},
 	}
@@ -29,8 +29,9 @@ func TestDeterminateImageType(t *testing.T) {
 		defer img.Close()
 
 		if VipsIsTypeSupported(file.expected) {
-			if DetermineImageType(buf) != file.expected {
-				t.Fatalf("Image type is not valid: %s != %s", file.name, ImageTypes[file.expected])
+			value := DetermineImageType(buf)
+			if value != file.expected {
+				t.Fatalf("Image type is not valid: %s != %s, got: %s", file.name, ImageTypes[file.expected], ImageTypes[value])
 			}
 		}
 	}
@@ -47,7 +48,7 @@ func TestDeterminateImageTypeName(t *testing.T) {
 		{"test.gif", "gif"},
 		{"test.pdf", "pdf"},
 		{"test.svg", "svg"},
-		{"test.jp2", "magick"},
+		// {"test.jp2", "magick"},
 		{"test.heic", "heif"},
 	}
 
@@ -56,8 +57,9 @@ func TestDeterminateImageTypeName(t *testing.T) {
 		buf, _ := ioutil.ReadAll(img)
 		defer img.Close()
 
-		if DetermineImageTypeName(buf) != file.expected {
-			t.Fatalf("Image type is not valid: %s != %s", file.name, file.expected)
+		value := DetermineImageTypeName(buf)
+		if value != file.expected {
+			t.Fatalf("Image type is not valid: %s != %s, got: %s", file.name, file.expected, value)
 		}
 	}
 }