Added example about reading a thumbnail from a raw image.

Magick.NET.sln

@@ -36,6 +36,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "docs", "docs", "{6D1DE15B-E
 		docs\LosslessCompression.md = docs\LosslessCompression.md
 		docs\ReadingImages.md = docs\ReadingImages.md
 		docs\Readme.md = docs\Readme.md
+		docs\ReadRawThumbnail.md = docs\ReadRawThumbnail.md
 		docs\ResizeImage.md = docs\ResizeImage.md
 		docs\UsingColors.md = docs\UsingColors.md
 		docs\Watermark.md = docs\Watermark.md

docs/ReadRawThumbnail.md

@@ -0,0 +1,29 @@
+# Read raw thumbnail
+
+## Read thumbnail from raw image
+
+```C#
+// Setup DNG read defines
+var defines = new DngReadDefines
+{
+    ReadThumbnail = true
+};
+
+// Create empty image
+using var image = new MagickImage();
+
+// Copy the defines to the settings
+image.Settings.SetDefines(defines);
+
+// Read only meta data of the image
+image.Ping(SampleFiles.StillLifeCR2);
+
+// Get thumbnail data
+var thumbnailData = image.GetProfile("dng:thumbnail")?.GetData();
+
+if (thumbnailData != null)
+{
+    // Read the thumbnail image
+    using var thumbnail = new MagickImage(thumbnailData);
+}
+```

docs/Readme.md

@@ -108,6 +108,8 @@ provide you with some help on how to use Magick.NET.
 - [Exif data](ExifData.md)
   - Read exif data
   - Create thumbnail from exif data
+- [Read raw thumbnail](ReadRawThumbnail.md)
+  - Read thumbnail from raw image
 - [Lossless compression](LosslessCompression.md)
   - Lossless compress JPEG logo
 - [Detailed debug information](DetailedDebugInformation.md)

samples/Magick.NET.Samples/ReadRawThumbnail.cs

@@ -0,0 +1,37 @@
+// Copyright Dirk Lemstra https://github.com/dlemstra/Magick.NET.
+// Licensed under the Apache License, Version 2.0.
+
+using ImageMagick;
+using ImageMagick.Formats;
+
+namespace Magick.NET.Samples;
+
+public static class ReadRawThumbnailSamples
+{
+    public static void ReadRawThumbnail()
+    {
+        // Setup DNG read defines
+        var defines = new DngReadDefines
+        {
+            ReadThumbnail = true
+        };
+
+        // Create empty image
+        using var image = new MagickImage();
+
+        // Copy the defines to the settings
+        image.Settings.SetDefines(defines);
+
+        // Read only meta data of the image
+        image.Ping(SampleFiles.StillLifeCR2);
+
+        // Get thumbnail data
+        var thumbnailData = image.GetProfile("dng:thumbnail")?.GetData();
+
+        if (thumbnailData != null)
+        {
+            // Read the thumbnail image
+            using var thumbnail = new MagickImage(thumbnailData);
+        }
+    }
+}