Fix floating point comparison.

Former-commit-id: 07e46b47420a5f8d951fa42d67e8773d37e3ca6c
Former-commit-id: 759ab68a95a18a31a5a53458a21a7b3cc24b5f40
Former-commit-id: ba4905924bac7bd9ac751eafc4c2322a96c88d05

src/ImageProcessor/Common/Helpers/ImageMaths.cs

@@ -216,19 +216,19 @@ namespace ImageProcessor
             switch (channel)
             {
                 case RgbaComponent.R:
-                    delegateFunc = (imageBase, x, y, b) => imageBase[x, y].R != b;
+                    delegateFunc = (imageBase, x, y, b) => Math.Abs(imageBase[x, y].R - b) > Epsilon;
                     break;
 
                 case RgbaComponent.G:
-                    delegateFunc = (imageBase, x, y, b) => imageBase[x, y].G != b;
+                    delegateFunc = (imageBase, x, y, b) => Math.Abs(imageBase[x, y].G - b) > Epsilon;
                     break;
 
                 case RgbaComponent.A:
-                    delegateFunc = (imageBase, x, y, b) => imageBase[x, y].A != b;
+                    delegateFunc = (imageBase, x, y, b) => Math.Abs(imageBase[x, y].A - b) > Epsilon;
                     break;
 
                 default:
-                    delegateFunc = (imageBase, x, y, b) => imageBase[x, y].B != b;
+                    delegateFunc = (imageBase, x, y, b) => Math.Abs(imageBase[x, y].B - b) > Epsilon;
                     break;
             }
 
@@ -240,8 +240,6 @@ namespace ImageProcessor
                     {
                         if (delegateFunc(imageBase, x, y, componentValue))
                         {
-                            var c = imageBase[x, y];
-
                             return y;
                         }
                     }