From 681c921b0bf3da865788fdceea9198ec0d73cdc8 Mon Sep 17 00:00:00 2001
From: Ildar Khayrutdinov <ildarkhairutdin@gmail.com>
Date: Mon, 20 Feb 2023 11:19:59 +0300
Subject: [PATCH] add TiffInkSet property

---
 .../Formats/Tiff/Constants/TiffInkSet.cs      | 26 +++++++++++++++++++
 .../Formats/Tiff/TiffFrameMetadata.cs         | 10 +++++++
 2 files changed, 36 insertions(+)
 create mode 100644 src/ImageSharp/Formats/Tiff/Constants/TiffInkSet.cs

diff --git a/src/ImageSharp/Formats/Tiff/Constants/TiffInkSet.cs b/src/ImageSharp/Formats/Tiff/Constants/TiffInkSet.cs
new file mode 100644
index 000000000..abdaca890
--- /dev/null
+++ b/src/ImageSharp/Formats/Tiff/Constants/TiffInkSet.cs
@@ -0,0 +1,26 @@
+// Copyright (c) Six Labors.
+// Licensed under the Six Labors Split License.
+
+using SixLabors.ImageSharp.Metadata.Profiles.Exif;
+
+namespace SixLabors.ImageSharp.Formats.Tiff.Constants;
+
+/// <summary>
+/// Enumeration representing the set of inks used in a separated (<see cref="TiffPhotometricInterpretation.Separated"/>) image.
+/// </summary>
+public enum TiffInkSet : ushort
+{
+    /// <summary>
+    /// CMYK.
+    /// The order of the components is cyan, magenta, yellow, black.
+    /// Usually, a value of 0 represents 0% ink coverage and a value of 255 represents 100% ink coverage for that component, but see DotRange.
+    /// The <see cref="ExifTagValue.InkNames"/> field should not exist when InkSet=1.
+    /// </summary>
+    Cmyk = 1,
+
+    /// <summary>
+    /// Not CMYK.
+    /// See the <see cref="ExifTagValue.InkNames"/> field for a description of the inks to be used.
+    /// </summary>
+    NotCmyk = 2
+}
diff --git a/src/ImageSharp/Formats/Tiff/TiffFrameMetadata.cs b/src/ImageSharp/Formats/Tiff/TiffFrameMetadata.cs
index 5d0b85bf2..c0cbd7e87 100644
--- a/src/ImageSharp/Formats/Tiff/TiffFrameMetadata.cs
+++ b/src/ImageSharp/Formats/Tiff/TiffFrameMetadata.cs
@@ -55,6 +55,11 @@ public class TiffFrameMetadata : IDeepCloneable
     /// </summary>
     public TiffPredictor? Predictor { get; set; }
 
+    /// <summary>
+    /// Gets or sets the set of inks used in a separated (<see cref="TiffPhotometricInterpretation.Separated"/>) image.
+    /// </summary>
+    public TiffInkSet? InkSet { get; set; }
+
     /// <summary>
     /// Returns a new <see cref="TiffFrameMetadata"/> instance parsed from the given Exif profile.
     /// </summary>
@@ -102,6 +107,11 @@ public class TiffFrameMetadata : IDeepCloneable
                 meta.Predictor = (TiffPredictor)predictorValue.Value;
             }
 
+            if (profile.TryGetValue(ExifTag.InkSet, out IExifValue<ushort>? inkSetValue))
+            {
+                meta.InkSet = (TiffInkSet)inkSetValue.Value;
+            }
+
             profile.RemoveValue(ExifTag.BitsPerSample);
             profile.RemoveValue(ExifTag.Compression);
             profile.RemoveValue(ExifTag.PhotometricInterpretation);