diff --git a/resizer.go b/resizer.go
index d3bed89..a76944f 100644
--- a/resizer.go
+++ b/resizer.go
@@ -320,12 +320,12 @@ func rotateAndFlipImage(image *C.VipsImage, o Options) (*C.VipsImage, bool, erro
 
 	if o.Flip {
 		rotated = true
-		image, err = vipsFlip(image, Vertical)
+		image, err = vipsFlip(image, Horizontal)
 	}
 
 	if o.Flop {
 		rotated = true
-		image, err = vipsFlip(image, Horizontal)
+		image, err = vipsFlip(image, Vertical)
 	}
 	return image, rotated, err
 }
diff --git a/testdata/exif/Landscape_1_out.jpg b/testdata/exif/Landscape_1_out.jpg
index 033589e..1ffcaaf 100644
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diff --git a/testdata/exif/Landscape_2_out.jpg b/testdata/exif/Landscape_2_out.jpg
index 1b2259f..aab8a2a 100644
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diff --git a/testdata/exif/Landscape_3_out.jpg b/testdata/exif/Landscape_3_out.jpg
index 681964a..a7132c7 100644
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diff --git a/testdata/exif/Landscape_4_out.jpg b/testdata/exif/Landscape_4_out.jpg
index fee30ea..95b8ea9 100644
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diff --git a/testdata/exif/Landscape_5_out.jpg b/testdata/exif/Landscape_5_out.jpg
index fbd8f5b..5227db8 100644
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diff --git a/testdata/exif/Landscape_6_out.jpg b/testdata/exif/Landscape_6_out.jpg
index 1ec5d12..ea031f7 100644
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diff --git a/testdata/exif/Landscape_7_out.jpg b/testdata/exif/Landscape_7_out.jpg
index 8a4f94c..0e6350b 100644
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diff --git a/testdata/exif/Landscape_8_out.jpg b/testdata/exif/Landscape_8_out.jpg
index 3e50c6f..04f6b2c 100644
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diff --git a/testdata/test_gif.jpg b/testdata/test_gif.jpg
index 7f28bce..d2ae362 100644
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diff --git a/testdata/test_pdf.jpg b/testdata/test_pdf.jpg
index bbb26c5..f80af8b 100644
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diff --git a/testdata/test_smart_crop.jpg b/testdata/test_smart_crop.jpg
index ff4a349..5acb94a 100644
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diff --git a/testdata/test_svg.jpg b/testdata/test_svg.jpg
index 77b4714..dba7747 100644
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diff --git a/testdata/transparent_trim.png b/testdata/transparent_trim.png
index 8087810..3be5f96 100644
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