Handle nullability in decoder base

src/ImageSharp/ColorSpaces/Conversion/Implementation/Icc/IccProfileConverter.cs

@@ -22,7 +22,7 @@ internal static class IccProfileConverter
     /// <param name="image">The image to convert.</param>
     /// <param name="inputIccProfile">The input ICC profile.</param>
     /// <param name="outputIccProfile">The output ICC profile. </param>
-    public static void Convert(Image image, IccProfile? inputIccProfile, IccProfile? outputIccProfile)
+    public static void Convert(Image image, IccProfile inputIccProfile, IccProfile outputIccProfile)
         => image.AcceptVisitor(new IccProfileConverterVisitor(inputIccProfile, outputIccProfile));
 
     /// <summary>
@@ -32,14 +32,9 @@ internal static class IccProfileConverter
     /// <param name="image">The image to convert.</param>
     /// <param name="inputIccProfile">The input ICC profile.</param>
     /// <param name="outputIccProfile">The output ICC profile. </param>
-    public static void Convert<TPixel>(Image<TPixel> image, IccProfile? inputIccProfile, IccProfile? outputIccProfile)
+    public static void Convert<TPixel>(Image<TPixel> image, IccProfile inputIccProfile, IccProfile outputIccProfile)
         where TPixel : unmanaged, IPixel<TPixel>
     {
-        if (inputIccProfile is null || outputIccProfile is null)
-        {
-            return;
-        }
-
         IccDataToPcsConverter converterDataToPcs = new(inputIccProfile);
         IccPcsToDataConverter converterPcsToData = new(outputIccProfile);
         Configuration configuration = image.GetConfiguration();
@@ -68,10 +63,10 @@ internal static class IccProfileConverter
 
     private readonly struct IccProfileConverterVisitor : IImageVisitor
     {
-        private readonly IccProfile? inputIccProfile;
-        private readonly IccProfile? outputIccProfile;
+        private readonly IccProfile inputIccProfile;
+        private readonly IccProfile outputIccProfile;
 
-        public IccProfileConverterVisitor(IccProfile? inputIccProfile, IccProfile? outputIccProfile)
+        public IccProfileConverterVisitor(IccProfile inputIccProfile, IccProfile outputIccProfile)
         {
             this.inputIccProfile = inputIccProfile;
             this.outputIccProfile = outputIccProfile;

src/ImageSharp/Formats/ImageDecoder.cs

@@ -5,6 +5,7 @@
 using SixLabors.ImageSharp.ColorSpaces.Conversion.Icc;
 using SixLabors.ImageSharp.ColorSpaces.Conversion.Implementation.Icc;
 using SixLabors.ImageSharp.IO;
+using SixLabors.ImageSharp.Metadata.Profiles.Icc;
 using SixLabors.ImageSharp.PixelFormats;
 using SixLabors.ImageSharp.Processing;
 
@@ -157,7 +158,11 @@ public abstract class ImageDecoder : IImageDecoder
             return;
         }
 
-        IccProfileConverter.Convert(image, image.Metadata?.IccProfile, SrgbV4Profile.GetProfile());
+        IccProfile profile = image.Metadata?.IccProfile;
+        if (profile is not null)
+        {
+            IccProfileConverter.Convert(image, profile, SrgbV4Profile.GetProfile());
+        }
     }
 
     /// <summary>