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src/ImageSharp/ColorProfiles/Icc/Calculators/LutABCalculator.cs

@@ -127,7 +127,7 @@ internal partial class LutABCalculator : IVector4Calculator
 
         Guard.IsTrue(
             hasACurve || hasBCurve || hasMCurve || hasMatrix || hasClut,
-            nameof(curveB),
+            "entry",
             "AToB or BToA tag must contain at least one processing element");
 
         if (hasACurve)

src/ImageSharp/Metadata/Profiles/ICC/TagDataEntries/IccLutAToBTagDataEntry.cs

@@ -128,7 +128,7 @@ internal sealed class IccLutAToBTagDataEntry : IccTagDataEntry, IEquatable<IccLu
             && this.OutputChannelCount == other.OutputChannelCount
             && this.Matrix3x3.Equals(other.Matrix3x3)
             && this.Matrix3x1.Equals(other.Matrix3x1)
-            && this.ClutValues.Equals(other.ClutValues)
+            && Equals(this.ClutValues, other.ClutValues)
             && EqualsCurve(this.CurveB, other.CurveB)
             && EqualsCurve(this.CurveM, other.CurveM)
             && EqualsCurve(this.CurveA, other.CurveA);
@@ -168,7 +168,7 @@ internal sealed class IccLutAToBTagDataEntry : IccTagDataEntry, IEquatable<IccLu
             return true;
         }
 
-        if (entryNull)
+        if (thisNull || entryNull)
         {
             return false;
         }

src/ImageSharp/Metadata/Profiles/ICC/TagDataEntries/IccLutBToATagDataEntry.cs

@@ -128,7 +128,7 @@ internal sealed class IccLutBToATagDataEntry : IccTagDataEntry, IEquatable<IccLu
             && this.OutputChannelCount == other.OutputChannelCount
             && this.Matrix3x3.Equals(other.Matrix3x3)
             && this.Matrix3x1.Equals(other.Matrix3x1)
-            && this.ClutValues.Equals(other.ClutValues)
+            && Equals(this.ClutValues, other.ClutValues)
             && EqualsCurve(this.CurveB, other.CurveB)
             && EqualsCurve(this.CurveM, other.CurveM)
             && EqualsCurve(this.CurveA, other.CurveA);
@@ -167,7 +167,7 @@ internal sealed class IccLutBToATagDataEntry : IccTagDataEntry, IEquatable<IccLu
             return true;
         }
 
-        if (entryNull)
+        if (thisNull || entryNull)
         {
             return false;
         }