void Render(Surface dst, Surface src, Rectangle roi)
{
   //Environment values for fore/back colors placed into variables
   ColorBgra TopColor = (ColorBgra)EnvironmentParameters.ForeColor;
   ColorBgra BottomColor = (ColorBgra)EnvironmentParameters.BackColor;

   //Alpha information extracted from the fore/back colors
   int TopAlpha = TopColor.A;
   int BottomAlpha = BottomColor.A;

   //The difference between the two alpha values is calculated
   int Difference = BottomAlpha - TopAlpha;

   //The height of the image is placed into a variable
   float maxy = dst.Height - 1;

   //Two variables used in the effect's loops are created
   ColorBgra PixelColor;
   float yratio;
   float IntermediateAlpha;

   for (int y = roi.Top; y < roi.Bottom; y++)
   {
      for (int x = roi.Left; x < roi.Right; x++)
      {
         //The color of the current pixel is taken from the source surface
         PixelColor = src[x, y];

         //The distance from the top of the image in ratio form is found
         yratio = (y / maxy);

         //The alpha value of the color is modified to account for the distance from the top
         //Previous alpha value is considered.
         IntermediateAlpha = (byte)(  (yratio * Difference) + TopAlpha  );
         PixelColor.A = (byte)((PixelColor.A * IntermediateAlpha) / 255);

         //The modified color is put onto the destination surface
         dst[x, y] = PixelColor;
      }
   }
}