Color class ocColor library

[TOtto-EclipseIR]

References

• https://en.wikipedia.org/wiki/HSL_and_HSV
• http://codeitdown.com/hsl-hsb-hsv-color/
• https://psychology.fandom.com/wiki/HSL_and_HSV
• https://en.wikibooks.org/wiki/Color_Models:_RGB,_HSV,_HSL
• https://programmingdesignsystems.com/color/color-models-and-color-spaces/index.html
• https://colordesigner.io/convert/hsvtohsl

[TOtto-EclipseIR]

Color Components

• Grey/Value/Y
• Alpha/Opacity
• Transparency
• Red
• Green
• Blue
• Cyan
• Magenta
• Yellow
• Hue
• Saturation
• Cr
• Cb

Color Compounds

• RGB
• CMYK
• HSV
• YCC
• ORGB
• OHSV
• OYCC

Color Model

• Rgb
• Hsv
• Cmyk
• YCrCb

[TOtto-EclipseIR]

typedef struct RGB_t { unsigned char red, green, blue; } RGB;
typedef struct HSB_t { float hue, saturation, brightness; } HSB;

/*
 * Returns the hue, saturation, and brightness of the color.
 */
void RgbToHsb(struct RGB_t rgb, struct HSB_t* outHsb)
{
    // TODO check arguments

    float r = rgb.red / 255.0f;
    float g = rgb.green / 255.0f;
    float b = rgb.blue / 255.0f;
    float max = fmaxf(fmaxf(r, g), b);
    float min = fminf(fminf(r, g), b);
    float delta = max - min;
    if (delta != 0)
    {
        float hue;
        if (r == max)
        {
            hue = (g - b) / delta;
        }
        else
        {
            if (g == max)
            {
                hue = 2 + (b - r) / delta;
            }
            else
            {
                hue = 4 + (r - g) / delta;
            }
        }
        hue *= 60;
        if (hue < 0) hue += 360;
        outHsb->hue = hue;
    }
    else
    {
        outHsb->hue = 0;
    }
    outHsb->saturation = max == 0 ? 0 : (max - min) / max;
    outHsb->brightness = max;
}