From 405837e4cb54252abc78fa2d3b8af45656553ca9 Mon Sep 17 00:00:00 2001
From: Florian Levis <levis.florian@gmail.com>
Date: Wed, 28 Feb 2024 23:04:12 +0100
Subject: [PATCH 1/2] fix: add guards for MagickImage.Lower

---
 src/Magick.NET/MagickImage.cs                             | 6 +++++-
 tests/Magick.NET.Tests/MagickImageTests/TheLowerMethod.cs | 8 ++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/Magick.NET/MagickImage.cs b/src/Magick.NET/MagickImage.cs
index ca77cbc7c8..1e62ccfaab 100644
--- a/src/Magick.NET/MagickImage.cs
+++ b/src/Magick.NET/MagickImage.cs
@@ -3995,7 +3995,11 @@ public void LocalContrast(double radius, Percentage strength, Channels channels)
     /// <param name="size">The size of the edges.</param>
     /// <exception cref="MagickException">Thrown when an error is raised by ImageMagick.</exception>
     public void Lower(int size)
-        => _nativeInstance.RaiseOrLower(size, false);
+    {
+        Throw.IfNegative(nameof(size), size);
+
+        _nativeInstance.RaiseOrLower(size, false);
+    }
 
     /// <summary>
     /// Magnify image by integral size.
diff --git a/tests/Magick.NET.Tests/MagickImageTests/TheLowerMethod.cs b/tests/Magick.NET.Tests/MagickImageTests/TheLowerMethod.cs
index 2ea52c0059..04815b7c78 100644
--- a/tests/Magick.NET.Tests/MagickImageTests/TheLowerMethod.cs
+++ b/tests/Magick.NET.Tests/MagickImageTests/TheLowerMethod.cs
@@ -1,6 +1,7 @@
 // Copyright Dirk Lemstra https://github.com/dlemstra/Magick.NET.
 // Licensed under the Apache License, Version 2.0.
 
+using System;
 using ImageMagick;
 using Xunit;
 
@@ -10,6 +11,13 @@ public partial class MagickImageTests
 {
     public class TheLowerMethod
     {
+        [Fact]
+        public void ShouldThrowExceptionWhenSizeIsNegative()
+        {
+            using var image = new MagickImage(Files.FujiFilmFinePixS1ProJPG);
+            Assert.Throws<ArgumentException>("width", () => image.Lower(-1));
+        }
+
         [Fact]
         public void ShouldDarkenTheEdges()
         {

From 9016a733778348765425e17b810a777e77abc8ba Mon Sep 17 00:00:00 2001
From: Florian Levis <levis.florian@gmail.com>
Date: Thu, 29 Feb 2024 19:02:12 +0100
Subject: [PATCH 2/2] test: fix param name

---
 tests/Magick.NET.Tests/MagickImageTests/TheLowerMethod.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/Magick.NET.Tests/MagickImageTests/TheLowerMethod.cs b/tests/Magick.NET.Tests/MagickImageTests/TheLowerMethod.cs
index 04815b7c78..0840d4896e 100644
--- a/tests/Magick.NET.Tests/MagickImageTests/TheLowerMethod.cs
+++ b/tests/Magick.NET.Tests/MagickImageTests/TheLowerMethod.cs
@@ -15,7 +15,7 @@ public class TheLowerMethod
         public void ShouldThrowExceptionWhenSizeIsNegative()
         {
             using var image = new MagickImage(Files.FujiFilmFinePixS1ProJPG);
-            Assert.Throws<ArgumentException>("width", () => image.Lower(-1));
+            Assert.Throws<ArgumentException>("size", () => image.Lower(-1));
         }
 
         [Fact]