Marked properties as obsolete.

src/Magick.NET.Core/IMagickImage.cs

@@ -158,6 +158,7 @@ public partial interface IMagickImage : IDisposable
     /// Gets the preferred size of the image when encoding.
     /// </summary>
     /// <exception cref="MagickException">Thrown when an error is raised by ImageMagick.</exception>
+    [Obsolete("Will be removed in the next major release.")]
     IMagickGeometry? EncodingGeometry { get; }
 
     /// <summary>
@@ -184,6 +185,7 @@ public partial interface IMagickImage : IDisposable
     /// <summary>
     /// Gets the information about the format of the image.
     /// </summary>
+    [Obsolete("Will be removed in the next major release.")]
     IMagickFormatInfo? FormatInfo { get; }
 
     /// <summary>
@@ -220,6 +222,7 @@ public partial interface IMagickImage : IDisposable
     /// <summary>
     /// Gets a value indicating whether the instance is disposed.
     /// </summary>
+    [Obsolete("Will be removed in the next major release.")]
     bool IsDisposed { get; }
 
     /// <summary>

src/Magick.NET.Core/IMagickNET.cs

@@ -58,7 +58,7 @@ public interface IMagickNET
     /// </summary>
     /// <param name="name">The name of the environment variable.</param>
     /// <returns>The environment variable with the specified name.</returns>
-    string GetEnvironmentVariable(string name);
+    string? GetEnvironmentVariable(string name);
 
     /// <summary>
     /// Initializes ImageMagick.

src/Magick.NET/MagickImage.cs

@@ -7,7 +7,6 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
 using System.IO;
-using System.Runtime.InteropServices.ComTypes;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -644,6 +643,7 @@ public int Depth
     /// Gets the preferred size of the image when encoding.
     /// </summary>
     /// <exception cref="MagickException">Thrown when an error is raised by ImageMagick.</exception>
+    [Obsolete("Will be removed in the next major release.")]
     public IMagickGeometry? EncodingGeometry
         => MagickGeometry.FromString(_nativeInstance.EncodingGeometry);
 
@@ -688,6 +688,7 @@ public MagickFormat Format
     /// <summary>
     /// Gets the information about the format of the image.
     /// </summary>
+    [Obsolete("Will be removed in the next major release.")]
     public IMagickFormatInfo? FormatInfo
         => MagickFormatInfo.Create(Format);
 
@@ -755,6 +756,7 @@ public PixelInterpolateMethod Interpolate
     /// <summary>
     /// Gets a value indicating whether the instance is disposed.
     /// </summary>
+    [Obsolete("Will be removed in the next major release.")]
     public bool IsDisposed
         => _nativeInstance.IsDisposed;