Clamp YUV values to be within byte ranges (#1726)

Co-authored-by: NJesse Young <jesseyoungcomputer@gmail.com>

src/devices/Media/VideoDevice/VideoDevice.Converter.cs

@@ -159,11 +159,13 @@ namespace Iot.Device.Media
         /// <returns>RGB color.</returns>
         private static Color YuvToRgb(int y, int u, int v)
         {
-            byte r = (byte)(y + 1.4075 * (v - 128));
-            byte g = (byte)(y - 0.3455 * (u - 128) - (0.7169 * (v - 128)));
-            byte b = (byte)(y + 1.7790 * (u - 128));
+            byte r = Clamp(y + 1.4075 * (v - 128));
+            byte g = Clamp(y - 0.3455 * (u - 128) - (0.7169 * (v - 128)));
+            byte b = Clamp(y + 1.7790 * (u - 128));
 
             return Color.FromArgb(r, g, b);
         }
+
+        private static byte Clamp(double val) => (byte)(val > 255 ? 255 : val < 0 ? 0 : val);
     }
 }