System.Windows.Forms.ColorPickerForm.HuePicker._UpdateImage C# (CSharp) Method

            private void _UpdateImage()
            {
                double hue = 0f;
                double saturation = .9f;
                double luminosity = .5f;

                for (int i = 0; i < _image.width; i++)
                {
                    for (int k = 0; k < _image.height; k++)
                    {
                        hue = (float)(_image.height - k - 1) / _image.height;

                        // HSL to RGB convertion.
                        Color pixelColor = GetColorFromHSL(hue, saturation, luminosity);
                        _image.SetPixel(i, k, pixelColor.ToUColor());
                    }
                    _image.Apply();
                }
            }