How to change color of generating qr from black to red or green or blue(another color of black)

How to change color of generating qr to red or green or blue(another color of black)

I working in visual studio 2015 windows form application

I generating qr using message toolkit library and it working good without any problem

only i face problem how to change color qr code using message toolkit

my code

I try to replace color to red
Result of code below change all picture to red color
and this is wrong

MessagingToolkit.QRCode.Codec.QRCodeEncoder encoder = new MessagingToolkit.QRCode.Codec.QRCodeEncoder();
                    encoder.QRCodeScale = 8;
                    Bitmap bmp = ChangeColor(encoder.Encode(textBox1.Text), Color.Red);
                    pictureBox1.Image = bmp;
                    bmp.Save(sv.FileName, ImageFormat.Jpeg);

 public static Bitmap ChangeColor(Bitmap scrBitmap, Color color)
        {
            //You can change your new color here. Red,Green,LawnGreen any..  
            Color newColor = color;
            Color actualColor;
            //make an empty bitmap the same size as scrBitmap  
            Bitmap newBitmap = new Bitmap(scrBitmap.Width, scrBitmap.Height);
            for (int i = 0; i < scrBitmap.Width; i++)
            {
                for (int j = 0; j < scrBitmap.Height; j++)
                {
                    //get the pixel from the scrBitmap image  
                    actualColor = scrBitmap.GetPixel(i, j);
                    // > 150 because.. Images edges can be of low pixel colr. if we set all pixel color to new then there will be no smoothness left.  
                    if (actualColor.A > 150)
                        newBitmap.SetPixel(i, j, newColor);
                    else
                        newBitmap.SetPixel(i, j, actualColor);
                }
            }
            return newBitmap;
        }

Result wrong result