fix ternary casting

src/ImageSharp/Processing/Transforms/TransformHelpers.cs

@@ -32,17 +32,29 @@ namespace SixLabors.ImageSharp
             if (profile.GetValue(ExifTag.PixelXDimension) != null)
             {
                 profile.RemoveValue(ExifTag.PixelXDimension);
-                profile.SetValue(
-                    ExifTag.PixelXDimension,
-                    image.Width <= ushort.MaxValue ? (ushort)image.Width : (uint)image.Width);
+
+                if (image.Width <= ushort.MaxValue)
+                {
+                    profile.SetValue(ExifTag.PixelXDimension, (ushort)image.Width);
+                }
+                else
+                {
+                    profile.SetValue(ExifTag.PixelXDimension, (uint)image.Width);
+                }
             }
 
             if (profile.GetValue(ExifTag.PixelYDimension) != null)
             {
                 profile.RemoveValue(ExifTag.PixelYDimension);
-                profile.SetValue(
-                    ExifTag.PixelYDimension,
-                    image.Height <= ushort.MaxValue ? (ushort)image.Height : (uint)image.Height);
+
+                if (image.Height <= ushort.MaxValue)
+                {
+                    profile.SetValue(ExifTag.PixelYDimension, (ushort)image.Height);
+                }
+                else
+                {
+                    profile.SetValue(ExifTag.PixelYDimension, (uint)image.Height);
+                }
             }
         }
 

tests/ImageSharp.Tests/Processing/Transforms/TransformsHelpersTest.cs

@@ -0,0 +1,34 @@
+// Copyright (c) Six Labors and contributors.
+// Licensed under the Apache License, Version 2.0.
+
+using SixLabors.ImageSharp.MetaData.Profiles.Exif;
+using SixLabors.ImageSharp.PixelFormats;
+using Xunit;
+
+namespace SixLabors.ImageSharp.Tests.Processing.Transforms
+{
+    public class TransformsHelpersTest
+    {
+        [Fact]
+        public void HelperCanChangeExifDataType()
+        {
+            int xy = 1;
+
+            using (var img = new Image<Alpha8>(xy, xy))
+            {
+                var profile = new ExifProfile();
+                img.MetaData.ExifProfile = profile;
+                profile.SetValue(ExifTag.PixelXDimension, (uint)xy);
+                profile.SetValue(ExifTag.PixelYDimension, (uint)xy);
+
+                Assert.Equal(ExifDataType.Long, profile.GetValue(ExifTag.PixelXDimension).DataType);
+                Assert.Equal(ExifDataType.Long, profile.GetValue(ExifTag.PixelYDimension).DataType);
+
+                TransformHelpers.UpdateDimensionalMetData(img);
+
+                Assert.Equal(ExifDataType.Short, profile.GetValue(ExifTag.PixelXDimension).DataType);
+                Assert.Equal(ExifDataType.Short, profile.GetValue(ExifTag.PixelYDimension).DataType);
+            }
+        }
+    }
+}