diff --git a/tests/decode_images.rs b/tests/decode_images.rs
index ae1e573..910d43e 100644
--- a/tests/decode_images.rs
+++ b/tests/decode_images.rs
@@ -44,6 +44,18 @@ fn test_rgb_u8() {
     }
 }
 
+#[test]
+fn test_gray_u12() {
+    let img_file =
+        File::open("./tests/images/12bit.cropped.tiff").expect("Cannot find test image!");
+    let mut decoder = Decoder::new(img_file).expect("Cannot create decoder");
+    assert_eq!(decoder.colortype().unwrap(), ColorType::Gray(12));
+    assert!(match decoder.read_image() {
+        Err(tiff::TiffError::UnsupportedError(tiff::TiffUnsupportedError::UnsupportedColorType(_))) => true,
+        _ => false,
+    });
+}
+
 #[test]
 fn test_gray_u16() {
     let img_file =
@@ -104,6 +116,18 @@ fn test_gray_u64() {
     }
 }
 
+#[test]
+fn test_rgb_u12() {
+    let img_file =
+        File::open("./tests/images/12bit.cropped.rgb.tiff").expect("Cannot find test image!");
+    let mut decoder = Decoder::new(img_file).expect("Cannot create decoder");
+    assert_eq!(decoder.colortype().unwrap(), ColorType::RGB(12));
+    assert!(match decoder.read_image() {
+        Err(tiff::TiffError::UnsupportedError(tiff::TiffUnsupportedError::UnsupportedColorType(_))) => true,
+        _ => false,
+    });
+}
+
 #[test]
 fn test_rgb_u16() {
     let img_file = File::open("./tests/images/rgb-3c-16b.tiff").expect("Cannot find test image!");
diff --git a/tests/images/12bit.cropped.rgb.tiff b/tests/images/12bit.cropped.rgb.tiff
new file mode 100644
index 0000000..8c8bb58
Binary files /dev/null and b/tests/images/12bit.cropped.rgb.tiff differ
diff --git a/tests/images/12bit.cropped.tiff b/tests/images/12bit.cropped.tiff
new file mode 100644
index 0000000..f075b6e
Binary files /dev/null and b/tests/images/12bit.cropped.tiff differ