Прозрачность картинок, спрайтов

using SharpDX;
using SharpDX.Toolkit;
using SharpDX.Toolkit.Graphics;
using System;
 
namespace xGame
{
    class Sprite
    {
        public string fileName;
        public Texture2D Texture;
        public Vector2 Position;
        public Color color;
        public float Rotation;
        public Vector2 Origin;
        public Vector2 Scale;
        public SpriteEffects effect;
        public float Depth;
 
        public Rectangle Sector;
 
        public Sprite(string FileName)
        {
            fileName = FileName;
            Position = Vector2.Zero;
            color = Color.White;
            Rotation = 0;
            Scale = Vector2.One;
            Origin = Vector2.Zero;
            effect = SpriteEffects.None;
            Depth = 1.0f;
            Sector = Rectangle.Empty;
        }
 
        public void LoadContent(SharpDX.Toolkit.Content.ContentManager content)
        {
            Texture = content.Load<Texture2D>(fileName);
        }
 
        public virtual void Draw(SpriteBatch spriteBatch)
        {
            spriteBatch.Draw(Texture, Position, Sector, color, Rotation, Origin, Scale, effect, Depth);
        }
    }
}

using System;
using SharpDX;
using SharpDX.Toolkit;
using SharpDX.Toolkit.Graphics;
 
namespace Test
{
    class TestGame:Game
    {
        GraphicsDeviceManager gdManager;
        SpriteBatch spriteBatch;
 
        public TestGame()
        {
            gdManager = new GraphicsDeviceManager(this);
            gdManager.PreferredBackBufferHeight = 1000;
            gdManager.PreferredBackBufferWidth = 1200;
        }
 
        protected override void LoadContent()
        {
            spriteBatch = new SpriteBatch(GraphicsDevice);
            base.LoadContent();
        }
 
        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.Black);
            spriteBatch.Begin();
            spriteBatch.Draw(Texture2D.Load(GraphicsDevice,"wind.png"), new Vector2(0, 0), null, Color.White, 0, new Vector2(0, 0),1f, SpriteEffects.None, 0);
            spriteBatch.End();
            base.Draw(gameTime);
        }
    }
}