C#调节图片亮度

昨天去客户那里测试，需求才开始，所以很简单，就是测一下能不能接受到视频或图片，然后保存下来，现场客户说亮度不够，然后学了一下C#调节图片亮度，记录一下

学习的帖子在这：http://blog.csdn.net/kenkao/article/details/3148091

/// <summary>
        /// 图像明暗调整
        /// </summary>
        /// <param name="b">原始图</param>
        /// <param name="degree">亮度[-255, 255]</param>
        /// <returns></returns>
        public static Bitmap KiLighten(Bitmap b, int degree)
        {
            if (b == null)
            {
                return null;
            }

            if (degree < -255) degree = -255;
            if (degree > 255) degree = 255;

            try
            {

                int width = b.Width;
                int height = b.Height;

                int pix = 0;

                BitmapData data = b.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);

                unsafe
                {
                    byte* p = (byte*)data.Scan0;
                    int offset = data.Stride - width * 3;
                    for (int y = 0; y < height; y++)
                    {
                        for (int x = 0; x < width; x++)
                        {
                            // 处理指定位置像素的亮度
                            for (int i = 0; i < 3; i++)
                            {
                                pix = p[i] + degree;

                                if (degree < 0) p[i] = (byte)Math.Max(0, pix);
                                if (degree > 0) p[i] = (byte)Math.Min(255, pix);

                            } // i
                            p += 3;
                        } // x
                        p += offset;
                    } // y
                }

                b.UnlockBits(data);

                return b;
            }
            catch
            {
                return null;
            }

        } // end of Lighten

然后调用

string savePath = @"C:UserswjrDesktop出差用1.png";
            Bitmap img = new Bitmap(@"C:UserswjrDesktop出差用WindowsFormsApplication1WindowsFormsApplication1WindowsFormsApplication1inReleaseCapture20170417 025826019.png");
            Bitmap a = KiLighten(img, 20);
            a.Save(savePath);

Bitmap a = KiLighten(img, 20);
我这里设置的是20，范围是-255~255，所以0是原图片亮度，我设置的20，所以图片亮度想过显示不明显，我弄个100的，看下效果