diff --git a/ABSpriteEditor/ABSpriteEditor/Sprites/IO/SpriteCompression.cs b/ABSpriteEditor/ABSpriteEditor/Sprites/IO/SpriteCompression.cs
index dd41a2f..3ec64e7 100644
--- a/ABSpriteEditor/ABSpriteEditor/Sprites/IO/SpriteCompression.cs
+++ b/ABSpriteEditor/ABSpriteEditor/Sprites/IO/SpriteCompression.cs
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Drawing;
 
 //
@@ -32,12 +33,20 @@ public static IEnumerable<byte> EnumerateCompressedMaskBytes(Bitmap bitmap)
         }
 
         private static IEnumerable<byte> EnumerateCompressedBytes(Bitmap bitmap, IEnumerable<byte> bytes)
+        {
+            if ((bitmap.Width < 1) || (bitmap.Height < 1))
+                throw new ArgumentException("bitmap must be at least 1x1");
+
+            return EnumerateCompressedBytes(bitmap.GetPixel(0, 0), bytes);
+        }
+
+        private static IEnumerable<byte> EnumerateCompressedBytes(Color firstPixel, IEnumerable<byte> bytes)
         {
             var writer = new BitWriter();
 
-            writer.WriteBit(bitmap.GetPixel(0, 0) == Color.White);
+            writer.WriteBit(firstPixel.ToArgb() == SpriteColours.White.ToArgb());
 
-            foreach (var span in bytes)
+            foreach (var span in GenerateBitSpans(bytes))
             {
                 WriteCompressedLength(writer, span - 1);
             }