ICODEBROKER

■ RGB를 HSL로 변환하기

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using System;

#region RGB를 HSL로 변환하기 - RGB2HSL(rgb, hsl)

/// <summary>

/// RGB를 HSL로 변환하기

/// </summary>

/// <param name="rgb">RGB</param>

/// <param name="hsl">HSL</param>

public void RGB2HSL(RGB rgb, HSL hsl)

{

    double red   = (rgb.Red   / 255d);

    double green = (rgb.Green / 255d);

    double blue  = (rgb.Blue  / 255d);

    double minimum = Math.Min(Math.Min(red, green), blue);

    double maximum = Math.Max(Math.Max(red, green), blue);

    double delta   = maximum - minimum;

    hsl.Luminance = (maximum + minimum) / 2d;

    if(delta == 0)

    {

        hsl.Hue        = 0;

        hsl.Saturation = 0d;

    }

    else

    {

        hsl.Saturation = (hsl.Luminance < 0.5d) ? (delta / (maximum + minimum)) : (delta / (2d - maximum - minimum));

        double deltaRed   = (((maximum - red)   / 6d) + (delta / 2d)) / delta;

        double deltaGreen = (((maximum - green) / 6d) + (delta / 2d)) / delta;

        double deltaBlue  = (((maximum - blue)  / 6d) + (delta / 2d)) / delta;

        double hue;

        if(red == maximum)

        {

            hue = deltaBlue - deltaGreen;

        }

        else if(green == maximum)

        {

            hue = (1d / 3d) + deltaRed - deltaBlue;

        }

        else

        {

            hue = (2d / 3d) + deltaGreen - deltaRed;

        }

        if(hue < 0d)

        {

            hue += 1d;

        }

        if(hue > 1d)

        {

            hue -= 1d;

        }

        hsl.Hue = (int)(hue * 360d);

    }

}

#endregion

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※ RGB 구조체 : 'RGB 색상 구조체' 참조

※ HSL 구조체 : 'HSL 색상 구조체' 참조