diff --git a/src/Aardvark.Base.Tensors.CSharp/PixImage/PixImage.cs b/src/Aardvark.Base.Tensors.CSharp/PixImage/PixImage.cs
index 1c386bc6..0baf96c3 100644
--- a/src/Aardvark.Base.Tensors.CSharp/PixImage/PixImage.cs
+++ b/src/Aardvark.Base.Tensors.CSharp/PixImage/PixImage.cs
@@ -1129,7 +1129,7 @@ public PixImage(Col.Format format, PixImage pixImage)
             var volume = CreateVolume<T>(srcInfo.Size.X, srcInfo.Size.Y, dstChannels.Length);
             volume.F = srcInfo.F;
 
-            if (format == pixImage.Format)
+            if (format == pixImage.Format && srcInfo.Size == volume.Size)
             {
                 pixImage.CopyVolumeTo(volume);
             }
diff --git a/src/Aardvark.Base.Tensors.CSharp/PixImage/PixVolume.cs b/src/Aardvark.Base.Tensors.CSharp/PixImage/PixVolume.cs
index 2a2ea2f1..6a43b2ca 100644
--- a/src/Aardvark.Base.Tensors.CSharp/PixImage/PixVolume.cs
+++ b/src/Aardvark.Base.Tensors.CSharp/PixImage/PixVolume.cs
@@ -192,7 +192,7 @@ public PixVolume(Col.Format format, PixVolume pixVolume)
             var tensor4 = CreateTensor4<T>(srcInfo.Size.X, srcInfo.Size.Y, srcInfo.Size.Z, dstChannels.Length);
             tensor4.F = pixVolume.Tensor4Info.F;
 
-            if (format == pixVolume.Format)
+            if (format == pixVolume.Format && srcInfo.Size == tensor4.Size)
             {
                 pixVolume.CopyTensor4To(tensor4);
             }
diff --git a/src/Tests/Aardvark.Base.Tests/Images/PixImageTests.cs b/src/Tests/Aardvark.Base.Tests/Images/PixImageTests.cs
index c26dce65..01b77c0c 100644
--- a/src/Tests/Aardvark.Base.Tests/Images/PixImageTests.cs
+++ b/src/Tests/Aardvark.Base.Tests/Images/PixImageTests.cs
@@ -448,6 +448,23 @@ public void FormatConversionBGRAToRG()
 
         #region From RGB
 
+        [Test]
+        public void FormatConversionRGBToRGBWithAdditionalChannel()
+        {
+            var getRandom = s_randomValues[typeof(byte)];
+            var volume = ImageTensors.CreateImageVolume<byte>(new V3l(54, 23, 4));
+            volume.Data.SetByIndex((_) => (byte)getRandom(rnd));
+            var src = new PixImage<byte>(Col.Format.RGB, volume);
+            var dst = new PixImage<byte>(Col.Format.RGB, src);
+
+            src.GetChannel(0L).ForeachCoord((coord) =>
+            {
+                var expected = GetColor<byte, C3b>(src, coord);
+                var actual = GetColor<byte, C3b>(dst, coord);
+                Assert.AreEqual(expected, actual);
+            });
+        }
+
         [Test]
         public void FormatConversionRGBToBGRA()
             => FormatConversion<byte, byte, C3b, C4b>(Col.Format.RGB, Col.Format.BGRA, c => c.ToC4b());
diff --git a/src/Tests/Aardvark.Base.Tests/Images/PixVolumeTests.cs b/src/Tests/Aardvark.Base.Tests/Images/PixVolumeTests.cs
index cb4f924c..fab2e4dc 100644
--- a/src/Tests/Aardvark.Base.Tests/Images/PixVolumeTests.cs
+++ b/src/Tests/Aardvark.Base.Tests/Images/PixVolumeTests.cs
@@ -356,6 +356,23 @@ public void TypeConversionDoubleToFloat()
 
         #region From RGB
 
+        [Test]
+        public void FormatConversionRGBToRGBWithAdditionalChannel()
+        {
+            var getRandom = PixImageTests.s_randomValues[typeof(byte)];
+            var tensor = ImageTensors.CreateImageTensor4<byte>(new V4l(54, 23, 11, 4));
+            tensor.Data.SetByIndex((_) => (byte)getRandom(rnd));
+            var src = new PixVolume<byte>(Col.Format.RGB, tensor);
+            var dst = new PixVolume<byte>(Col.Format.RGB, src);
+
+            src.GetChannel(0L).ForeachCoord((coord) =>
+            {
+                var expected = GetColor<byte, C3b>(src, coord);
+                var actual = GetColor<byte, C3b>(dst, coord);
+                Assert.AreEqual(expected, actual);
+            });
+        }
+
         [Test]
         public void FormatConversionRGBToBGRA()
             => FormatConversion<byte, byte, C3b, C4b>(Col.Format.RGB, Col.Format.BGRA, c => c.ToC4b());