c# – 删除非红色调色像素

I am trying to remove the pixels which
do not involve red tones.

到目前为止,一个基本的代码似乎实现了我想要的.

private void removeUnRedCellsBtn_Click(object sender,EventArgs e)
        {
            byte threshold = Convert.ToByte(diffTxtBox.Text); 
            byte r,g,b;
            for (int i = 0; i < m_Bitmap.Width; i++)
            {
                for (int j = 0; j < m_Bitmap.Height; j++)
                {
                    r = im_matrix[i,j].R;
                    g = im_matrix[i,j].G;
                    b = im_matrix[i,j].B;
                    if ((r - b) < threshold || (r - g) < threshold)
                    {
                        m_Bitmap.SetPixel(i,j,Color.White);
                    }

                }
            }
            pictureArea_PictureBox.Image = m_Bitmap;
        }

基本上,如果(红色和蓝色)或(红色和绿色)的差值小于阈值,则将像素设置为白色.

My results seems to be promising
however I am wondering if there is a
better solution for determining
whether a pixel involves red tones in
it.

我的阈值为75的结果是

任何算法或想法都将非常感激.

提前致谢