// Colorize : Picture
private void pictureBoxColorize_Paint(object sender, PaintEventArgs e)
{
int width = pictureBoxColorize.Width;
int height = pictureBoxColorize.Height;
double increment = (double)width / 255.0;
int x = 0;
for (double i = 0; i < width; i += increment, x++)
{
Pen pen = new Pen(Do.HSLtoRGBColor(x / 255.0, (double)colorizeSaturation.Value / 255.0, 0.5));
e.Graphics.DrawLine(pen, (float)i, 0, (float)i, height);
}
double ratio = (double)pictureBoxColorize.Width / 255.0;
x = Math.Min(pictureBoxColorize.Width, Math.Max(0, (int)((double)colorizeHue.Value * ratio)));
e.Graphics.DrawLine(new Pen(Color.Black), x, 0, x, height);
}