. Brightness(亮度) 一种颜色的范围，表示它与一系列从很昏暗（黑）到很明亮（耀眼）的无色彩的颜色之间的相似处

本文链接：https://blog.youkuaiyun.com/sfmax123/article/details/5193946

本文介绍了一种基于Gamma校正的色彩调整算法，该算法通过设置红、绿、蓝三通道的Gamma值来改变图片的颜色表现。文章详细展示了如何创建Gamma数组，并应用到每个像素上进行颜色调整。

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/// <summary>
        /// 曲线
        /// </summary>
        /// <param name="red">红</param>
        /// <param name="green">绿</param>
        /// <param name="blue">蓝</param>
        public void SetGamma(double red, double green, double blue)
        {
            Bitmap temp = (Bitmap)_currentBitmap;
            Bitmap bmap = (Bitmap)temp.Clone();
            Color c;
            byte[] redGamma = CreateGammaArray(red);
            byte[] greenGamma = CreateGammaArray(green);
            byte[] blueGamma = CreateGammaArray(blue);
            for (int i = 0; i < bmap.Width; i++)
            {
                for (int j = 0; j < bmap.Height; j++)
                {
                    c = bmap.GetPixel(i, j);
                    bmap.SetPixel(i, j, Color.FromArgb(redGamma[c.R], greenGamma[c.G], blueGamma[c.B]));
                }
            }
            _currentBitmap = (Bitmap)bmap.Clone();
        }

        /// <summary>
        /// 获取曲线数组
        /// </summary>
        /// <param name="color">色彩</param>
        /// <returns>数组</returns>
        private byte[] CreateGammaArray(double color)
        {
            byte[] gammaArray = new byte[256];
            for (int i = 0; i < 256; ++i)
            {
                gammaArray[i] = (byte)Math.Min(255, (int)((255.0 * Math.Pow(i / 255.0, 1.0 / color)) + 0.5));
            }
            return gammaArray;
        }