added tolerance for pixel color for better windows 7 compatibility

fisher/Form1.cs

@@ -197,8 +197,10 @@ private void backgroundThread_DoWork(object sender, DoWorkEventArgs e) {
 						printMessage(baitUsed, baitToUse, " bait used.\nWaiting for cast result.");
 						Invoke(new Action(() => Refresh()));
 						//performs cast
+						Invoke(new Action(() => Cursor.Position = locationTimerCaughtFish));
 						Color color = helper.GetPixelColor(locationTimerCaughtFish);
-						if (color == colorTimerCaughtFishKong || color == colorTimerCaughtFishSteam) {
+						//if (color == colorTimerCaughtFishKong || color == colorTimerCaughtFishSteam) {
+						if (helper.AreColorsSimilar(color, colorTimerCaughtFishKong, 20)) { 
 							printMessage(baitUsed, baitToUse, " bait used.\nPerforming catch.");
 							Invoke(new Action(() => Refresh()));
 							Invoke(new Action(() => helper.catchFish(location100Position, oneHundredCatchColor)));

fisher/MethodHelper.cs

@@ -89,6 +89,12 @@ public Color GetPixelColor(Point location) {
 			return color;
 		}
 
+		public bool AreColorsSimilar(Color c1, Color c2, int tolerance) {
+			return Math.Abs(c1.R - c2.R) < tolerance &&
+				   Math.Abs(c1.G - c2.G) < tolerance &&
+				   Math.Abs(c1.B - c2.B) < tolerance;
+		}
+
 		public Dictionary<int, Bitmap> GetScreenShot(bool saveScreenshot) {
 			//Using `SystemInformation.VirtualScreen` rather than `Screen.PrimaryScreen` 
 			//ensures that the program can look at all screens for the start button.