diff --git a/src/decoder/image.rs b/src/decoder/image.rs
index afe6334..6d82d7f 100644
--- a/src/decoder/image.rs
+++ b/src/decoder/image.rs
@@ -358,7 +358,6 @@ impl Image {
                     PhotometricInterpretation::BlackIsZero => {
                         decoder.set_color_transform(jpeg::ColorTransform::None)
                     }
-                    PhotometricInterpretation::RGBPalette => todo!(),
                     PhotometricInterpretation::TransparencyMask => {
                         decoder.set_color_transform(jpeg::ColorTransform::None)
                     }
@@ -368,8 +367,13 @@ impl Image {
                     PhotometricInterpretation::YCbCr => {
                         decoder.set_color_transform(jpeg::ColorTransform::YCbCr)
                     }
-                    PhotometricInterpretation::CIELab => todo!(),
-                    _ => todo!(),
+                    photometric_interpretation => {
+                        return Err(TiffError::UnsupportedError(
+                            TiffUnsupportedError::UnsupportedInterpretation(
+                                photometric_interpretation,
+                            ),
+                        ));
+                    }
                 }
 
                 let data = decoder.decode()?;
diff --git a/src/error.rs b/src/error.rs
index 0f979bb..d191295 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -148,10 +148,8 @@ pub enum TiffUnsupportedError {
     UnsupportedBitsPerChannel(u8),
     UnsupportedPlanarConfig(Option<PlanarConfiguration>),
     UnsupportedDataType,
+    UnsupportedInterpretation(PhotometricInterpretation),
     UnsupportedJpegFeature(UnsupportedFeature),
-    #[doc(hidden)]
-    /// Do not match against this variant. It may get removed.
-    __NonExhaustive,
 }
 
 impl fmt::Display for TiffUnsupportedError {
@@ -197,10 +195,16 @@ impl fmt::Display for TiffUnsupportedError {
                 write!(fmt, "Unsupported planar configuration “{:?}”.", config)
             }
             UnsupportedDataType => write!(fmt, "Unsupported data type."),
+            UnsupportedInterpretation(interpretation) => {
+                write!(
+                    fmt,
+                    "Unsupported photometric interpretation \"{:?}\".",
+                    interpretation
+                )
+            }
             UnsupportedJpegFeature(ref unsupported_feature) => {
                 write!(fmt, "Unsupported JPEG feature {:?}", unsupported_feature)
             }
-            __NonExhaustive => unreachable!(),
         }
     }
 }