diff --git a/src/ImageSharp/Formats/Tiff/TiffBitsPerSampleExtensions.cs b/src/ImageSharp/Formats/Tiff/TiffBitsPerSampleExtensions.cs
index 32ef547ba..4910cf952 100644
--- a/src/ImageSharp/Formats/Tiff/TiffBitsPerSampleExtensions.cs
+++ b/src/ImageSharp/Formats/Tiff/TiffBitsPerSampleExtensions.cs
@@ -50,9 +50,9 @@ namespace SixLabors.ImageSharp.Formats.Tiff
                         return TiffBitsPerSample.Bit24;
                     }
 
-                    if (bitsPerSample[0] == TiffConstants.BitsPerSampleRgb4Bit[0] &&
+                    if (bitsPerSample[2] == TiffConstants.BitsPerSampleRgb4Bit[2] &&
                         bitsPerSample[1] == TiffConstants.BitsPerSampleRgb4Bit[1] &&
-                        bitsPerSample[2] == TiffConstants.BitsPerSampleRgb4Bit[2])
+                        bitsPerSample[0] == TiffConstants.BitsPerSampleRgb4Bit[0])
                     {
                         return TiffBitsPerSample.Bit12;
                     }
diff --git a/src/ImageSharp/Formats/Tiff/TiffDecoderOptionsParser.cs b/src/ImageSharp/Formats/Tiff/TiffDecoderOptionsParser.cs
index 1b48cd08f..b38ff68c1 100644
--- a/src/ImageSharp/Formats/Tiff/TiffDecoderOptionsParser.cs
+++ b/src/ImageSharp/Formats/Tiff/TiffDecoderOptionsParser.cs
@@ -189,7 +189,7 @@ namespace SixLabors.ImageSharp.Formats.Tiff
                                 options.ColorType = TiffColorType.Rgb444;
                                 break;
                             default:
-                                TiffThrowHelper.ThrowNotSupported("Bits per sample is nut supported.");
+                                TiffThrowHelper.ThrowNotSupported("Bits per sample is not supported.");
                                 break;
                         }
                     }