C#調節圖片的透明度

---

C#調節圖片的透明度

---

/// <summary>
        /// 調節圖片的透明度
        /// </summary>
        /// <param name="bitmapImg">圖像對象</param>
        /// <param name="alpha">調節度</param>
        /// <returns>調節後的圖形對象</returns>
        public static Bitmap imgAlpha(Bitmap bitmapImg, int alpha)
        {
            Bitmap bitmap = new Bitmap(bitmapImg.Width, bitmapImg.Height, PixelFormat.Format32bppArgb);
            for (int h = 0; h < bitmapImg.Height; h++)
            {
                for (int w = 0; w < bitmapImg.Width; w++)
                {
                    Color color = bitmapImg.GetPixel(w, h);
                    bitmap.SetPixel(w, h, Color.FromArgb(alpha / 100, color.R, color.G, color.B));
                }
            }
            return bitmap;
        }
 //方法條調用
  Bitmap bitmap = imgAlpha(new Bitmap(@"F:\temp\image2.jpeg"), 12000);
            bitmap.Save(@"F:\temp\0001.png");
            bitmap.Dispose();