fix range check

src/ImageSharp/Common/Helpers/Numerics.cs

@@ -978,9 +978,9 @@ namespace SixLabors.ImageSharp
         /// Tells whether input value is outside of the 0..max range.
         /// </summary>
         /// <param name="value">Value.</param>
-        /// <param name="max">Maximum value, inclusive.</param>
+        /// <param name="max">Maximum value, exclusive.</param>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static bool IsOutOfRangeZeroToMax(int value, int max)
-            => (uint)value > (uint)max;
+        public static bool IsOutOfRangeZeroToExclusiveMax(int value, int max)
+            => (uint)value >= (uint)max;
     }
 }

src/ImageSharp/ImageFrame{TPixel}.cs

@@ -443,12 +443,12 @@ namespace SixLabors.ImageSharp
         [MethodImpl(InliningOptions.ShortMethod)]
         private void VerifyCoords(int x, int y)
         {
-            if (Numerics.IsOutOfRangeZeroToMax(x, this.Width))
+            if (Numerics.IsOutOfRangeZeroToExclusiveMax(x, this.Width))
             {
                 ThrowArgumentOutOfRangeException(nameof(x));
             }
 
-            if (Numerics.IsOutOfRangeZeroToMax(y, this.Height))
+            if (Numerics.IsOutOfRangeZeroToExclusiveMax(y, this.Height))
             {
                 ThrowArgumentOutOfRangeException(nameof(y));
             }

src/ImageSharp/Image{TPixel}.cs

@@ -452,12 +452,12 @@ namespace SixLabors.ImageSharp
         [MethodImpl(InliningOptions.ShortMethod)]
         private void VerifyCoords(int x, int y)
         {
-            if (Numerics.IsOutOfRangeZeroToMax(x, this.Width))
+            if (Numerics.IsOutOfRangeZeroToExclusiveMax(x, this.Width))
             {
                 ThrowArgumentOutOfRangeException(nameof(x));
             }
 
-            if (Numerics.IsOutOfRangeZeroToMax(y, this.Height))
+            if (Numerics.IsOutOfRangeZeroToExclusiveMax(y, this.Height))
             {
                 ThrowArgumentOutOfRangeException(nameof(y));
             }

src/ImageSharp/Memory/Buffer2D{T}.cs

@@ -97,7 +97,7 @@ namespace SixLabors.ImageSharp.Memory
         [MethodImpl(InliningOptions.ShortMethod)]
         public Span<T> DangerousGetRowSpan(int y)
         {
-            if (Numerics.IsOutOfRangeZeroToMax(y, this.Height))
+            if (Numerics.IsOutOfRangeZeroToExclusiveMax(y, this.Height))
             {
                 this.ThrowYOutOfRangeException(y);
             }