diff --git a/src/ImageSharp/Formats/Tiff/Constants/TiffPhotometricInterpretation.cs b/src/ImageSharp/Formats/Tiff/Constants/TiffPhotometricInterpretation.cs
index cb537dda3c..6585be6f2f 100644
--- a/src/ImageSharp/Formats/Tiff/Constants/TiffPhotometricInterpretation.cs
+++ b/src/ImageSharp/Formats/Tiff/Constants/TiffPhotometricInterpretation.cs
@@ -9,9 +9,8 @@ namespace SixLabors.ImageSharp.Formats.Tiff.Constants;
 public enum TiffPhotometricInterpretation : ushort
 {
     /// <summary>
-    /// Bilevel and grayscale: 0 is imaged as white. The maximum value is imaged as black.
-    ///
-    /// Not supported by the TiffEncoder.
+    /// <para>Bilevel and grayscale: 0 is imaged as white. The maximum value is imaged as black.</para>
+    /// <para>Not supported by the TiffEncoder.</para>
     /// </summary>
     WhiteIsZero = 0,
 
@@ -31,58 +30,50 @@ public enum TiffPhotometricInterpretation : ushort
     PaletteColor = 3,
 
     /// <summary>
-    /// A transparency mask.
-    ///
-    /// Not supported by the TiffEncoder.
+    /// <para>A transparency mask.</para>
+    /// <para>Not supported by the TiffEncoder.</para>
     /// </summary>
     TransparencyMask = 4,
 
     /// <summary>
-    /// Separated: usually CMYK (see Section 16 of the TIFF 6.0 specification).
-    ///
-    /// Not supported by the TiffEncoder.
+    /// <para>Separated: usually CMYK (see Section 16 of the TIFF 6.0 specification).</para>
+    /// <para>Not supported by the TiffEncoder.</para>
     /// </summary>
     Separated = 5,
 
     /// <summary>
-    /// YCbCr (see Section 21 of the TIFF 6.0 specification).
-    ///
-    /// Not supported by the TiffEncoder.
+    /// <para>YCbCr (see Section 21 of the TIFF 6.0 specification).</para>
+    /// <para>Not supported by the TiffEncoder.</para>
     /// </summary>
     YCbCr = 6,
 
     /// <summary>
-    /// 1976 CIE L*a*b* (see Section 23 of the TIFF 6.0 specification).
-    ///
-    /// Not supported by the TiffEncoder.
+    /// <para>1976 CIE L*a*b* (see Section 23 of the TIFF 6.0 specification).</para>
+    /// <para>Not supported by the TiffEncoder.</para>
     /// </summary>
     CieLab = 8,
 
     /// <summary>
-    /// ICC L*a*b* (see TIFF Specification, supplement 1).
-    ///
-    /// Not supported by the TiffEncoder.
+    /// <para>ICC L*a*b* (see TIFF Specification, supplement 1).</para>
+    /// <para>Not supported by the TiffEncoder.</para>
     /// </summary>
     IccLab = 9,
 
     /// <summary>
-    /// ITU L*a*b* (see RFC2301).
-    ///
-    /// Not supported by the TiffEncoder.
+    /// <para>ITU L*a*b* (see RFC2301).</para>
+    /// <para>Not supported by the TiffEncoder.</para>
     /// </summary>
     ItuLab = 10,
 
     /// <summary>
-    /// Color Filter Array (see the DNG specification).
-    ///
-    /// Not supported by the TiffEncoder.
+    /// <para>Color Filter Array (see the DNG specification).</para>
+    /// <para>Not supported by the TiffEncoder.</para>
     /// </summary>
     ColorFilterArray = 32803,
 
     /// <summary>
-    /// Linear Raw (see the DNG specification).
-    ///
-    /// Not supported by the TiffEncoder.
+    /// <para>Linear Raw (see the DNG specification).</para>
+    /// <para>Not supported by the TiffEncoder.</para>
     /// </summary>
     LinearRaw = 34892
 }
diff --git a/src/ImageSharp/Formats/Tiff/TiffBitsPerPixel.cs b/src/ImageSharp/Formats/Tiff/TiffBitsPerPixel.cs
index dc57c12f19..6cbacec354 100644
--- a/src/ImageSharp/Formats/Tiff/TiffBitsPerPixel.cs
+++ b/src/ImageSharp/Formats/Tiff/TiffBitsPerPixel.cs
@@ -19,9 +19,8 @@ public enum TiffBitsPerPixel
     Bit4 = 4,
 
     /// <summary>
-    /// 6 bits per pixel. 2 bit for each color channel.
-    ///
-    /// Note: The TiffEncoder does not yet support 2 bits per color channel and will default to 24 bits per pixel instead.
+    /// <para>6 bits per pixel. 2 bit for each color channel.</para>
+    /// <para>Note: The TiffEncoder does not yet support 2 bits per color channel and will default to 24 bits per pixel instead.</para>
     /// </summary>
     Bit6 = 6,
 
@@ -31,30 +30,26 @@ public enum TiffBitsPerPixel
     Bit8 = 8,
 
     /// <summary>
-    /// 10 bits per pixel, for gray images.
-    ///
-    /// Note: The TiffEncoder does not yet support 10 bits per pixel and will default to 24 bits per pixel instead.
+    /// <para>10 bits per pixel, for gray images.</para>
+    /// <para>Note: The TiffEncoder does not yet support 10 bits per pixel and will default to 24 bits per pixel instead.</para>
     /// </summary>
     Bit10 = 10,
 
     /// <summary>
-    /// 12 bits per pixel. 4 bit for each color channel.
-    ///
-    /// Note: The TiffEncoder does not yet support 4 bits per color channel and will default to 24 bits per pixel instead.
+    /// <para>12 bits per pixel. 4 bit for each color channel.</para>
+    /// <para>Note: The TiffEncoder does not yet support 4 bits per color channel and will default to 24 bits per pixel instead.</para>
     /// </summary>
     Bit12 = 12,
 
     /// <summary>
-    /// 14 bits per pixel, for gray images.
-    ///
-    /// Note: The TiffEncoder does not yet support 14 bits per pixel images and will default to 24 bits per pixel instead.
+    /// <para>14 bits per pixel, for gray images.</para>
+    /// <para>Note: The TiffEncoder does not yet support 14 bits per pixel images and will default to 24 bits per pixel instead.</para>
     /// </summary>
     Bit14 = 14,
 
     /// <summary>
-    /// 16 bits per pixel, for gray images.
-    ///
-    /// Note: The TiffEncoder does not yet support 16 bits per color channel and will default to 16 bits grayscale instead.
+    /// <para>16 bits per pixel, for gray images.</para>
+    /// <para>Note: The TiffEncoder does not yet support 16 bits per color channel and will default to 16 bits grayscale instead.</para>
     /// </summary>
     Bit16 = 16,
 
@@ -64,9 +59,8 @@ public enum TiffBitsPerPixel
     Bit24 = 24,
 
     /// <summary>
-    /// 30 bits per pixel. 10 bit for each color channel.
-    ///
-    /// Note: The TiffEncoder does not yet support 10 bits per color channel and will default to 24 bits per pixel instead.
+    /// <para>30 bits per pixel. 10 bit for each color channel.</para>
+    /// <para>Note: The TiffEncoder does not yet support 10 bits per color channel and will default to 24 bits per pixel instead.</para>
     /// </summary>
     Bit30 = 30,
 
@@ -76,23 +70,26 @@ public enum TiffBitsPerPixel
     Bit32 = 32,
 
     /// <summary>
-    /// 36 bits per pixel. 12 bit for each color channel.
-    ///
-    /// Note: The TiffEncoder does not yet support 12 bits per color channel and will default to 24 bits per pixel instead.
+    /// <para>36 bits per pixel. 12 bit for each color channel.</para>
+    /// <para>Note: The TiffEncoder does not yet support 12 bits per color channel and will default to 24 bits per pixel instead.</para>
     /// </summary>
     Bit36 = 36,
 
     /// <summary>
-    /// 42 bits per pixel. 14 bit for each color channel.
-    ///
-    /// Note: The TiffEncoder does not yet support 14 bits per color channel and will default to 24 bits per pixel instead.
+    /// <para>42 bits per pixel. 14 bit for each color channel.</para>
+    /// <para>Note: The TiffEncoder does not yet support 14 bits per color channel and will default to 24 bits per pixel instead.</para>
     /// </summary>
     Bit42 = 42,
 
     /// <summary>
-    /// 48 bits per pixel. 16 bit for each color channel.
-    ///
-    /// Note: The TiffEncoder does not yet support 16 bits per color channel and will default to 24 bits per pixel instead.
+    /// <para>48 bits per pixel. 16 bit for each color channel.</para>
+    /// <para>Note: The TiffEncoder does not yet support 16 bits per color channel and will default to 24 bits per pixel instead.</para>
     /// </summary>
     Bit48 = 48,
+
+    /// <summary>
+    /// <para>64 bits per pixel. 16 bit for each color channel.</para>
+    /// <para>Note: The TiffEncoder does not yet support 16 bits per color channel and will default to 32 bits per pixel instead.</para>
+    /// </summary>
+    Bit64 = 64,
 }
diff --git a/src/ImageSharp/Formats/Tiff/TiffEncoderCore.cs b/src/ImageSharp/Formats/Tiff/TiffEncoderCore.cs
index 94c7fb2b1e..ba8d2bd23e 100644
--- a/src/ImageSharp/Formats/Tiff/TiffEncoderCore.cs
+++ b/src/ImageSharp/Formats/Tiff/TiffEncoderCore.cs
@@ -391,6 +391,10 @@ internal sealed class TiffEncoderCore : IImageEncoderInternals
                     // Encoding not yet supported bits per pixel will default to 24 bits.
                     this.SetEncoderOptions(TiffBitsPerPixel.Bit24, TiffPhotometricInterpretation.Rgb, compression, TiffPredictor.None);
                     break;
+                case TiffBitsPerPixel.Bit64:
+                    // Encoding not yet supported bits per pixel will default to 32 bits.
+                    this.SetEncoderOptions(TiffBitsPerPixel.Bit32, TiffPhotometricInterpretation.Rgb, compression, TiffPredictor.None);
+                    break;
                 default:
                     this.SetEncoderOptions(bitsPerPixel, TiffPhotometricInterpretation.Rgb, compression, predictor);
                     break;
diff --git a/tests/ImageSharp.Tests/Formats/Tiff/TiffMetadataTests.cs b/tests/ImageSharp.Tests/Formats/Tiff/TiffMetadataTests.cs
index 40346cdd89..b671addf95 100644
--- a/tests/ImageSharp.Tests/Formats/Tiff/TiffMetadataTests.cs
+++ b/tests/ImageSharp.Tests/Formats/Tiff/TiffMetadataTests.cs
@@ -111,7 +111,7 @@ public class TiffMetadataTests
 
     [Theory]
     [InlineData(Cmyk, 1, TiffBitsPerPixel.Bit32, TiffPhotometricInterpretation.Separated, TiffInkSet.Cmyk)]
-    [InlineData(Cmyk64BitDeflate, 1, 64, TiffPhotometricInterpretation.Separated, TiffInkSet.Cmyk)]
+    [InlineData(Cmyk64BitDeflate, 1, TiffBitsPerPixel.Bit64, TiffPhotometricInterpretation.Separated, TiffInkSet.Cmyk)]
     [InlineData(YCbCrJpegCompressed, 1, TiffBitsPerPixel.Bit24, TiffPhotometricInterpretation.YCbCr, null)]
     public void Identify_Frames(string imagePath, int framesCount, TiffBitsPerPixel bitsPerPixel, TiffPhotometricInterpretation photometric, TiffInkSet? inkSet)
     {