//Fields
Form myForm = new Form();

//Initialize
System.Windows.Forms.Application.EnableVisualStyles();
Task.Run(() =>System.Windows.Forms.Application.Run(myForm));

//Update
for (int x = 0; x < GameManager.Instance.MapSize.x; x++)
{
    for (int y = 0; y < GameManager.Instance.MapSize.y; y++)
    {
        TerrainAnalysis[x, y] = UnityEngine.Random.Range(0f, 1f);
    }
}
CreateBitmapOfTerrainAnalysis(TerrainAnalysis, "TerrainAnalysis");

//drawing bitmap method... Specifically the last 2 lines.
/// <summary>
/// Creates a bitmap file of your terrain.
/// </summary>
/// <param name="terrain">The float array used to represent the terrain map. If you used a different data structure, modify this method to accept it.</param>
/// <param name="fileName">The name of the file. Do not include a file extension</param>
private void CreateBitmapOfTerrainAnalysis(float[,] terrain, string fileName)
{
    System.Drawing.Bitmap b = new System.Drawing.Bitmap(GameManager.Instance.MapSize.x, GameManager.Instance.MapSize.y);
    for (int x = 0; x < GameManager.Instance.MapSize.x; x++)
    {
        for (int y = 0; y < GameManager.Instance.MapSize.y; y++)
        {
            b.SetPixel(x, y, System.Drawing.Color.FromArgb((int)(terrain[x, y] * 255), (int)(terrain[x, y] * 255), (int)(terrain[x, y] * 255)));
        }
    }
    b.Save(fileName + ".bmp", System.Drawing.Imaging.ImageFormat.Bmp);
    System.Drawing.Graphics g = myForm.CreateGraphics();
    g.DrawImage(b, new Point(0, 0));
}