rgb_to_hsv()

glm::vec3 MayaFlux::Kinesis::rgb_to_hsv ( glm::vec3  rgb )

inlinenoexcept

Convert red, green and blue to hue, saturation and value.

Inverse of hsv_to_rgb. Hue is 0 for greys, where it is undefined.

Parameters

rgb	Red in x, green in y, blue in z, each in [0, 1].

Returns

Hue in x, saturation in y, value in z, each in [0, 1].

Definition at line 39 of file ColorSpace.hpp.

{
    const float cmax = std::max({ rgb.x, rgb.y, rgb.z });
    const float cmin = std::min({ rgb.x, rgb.y, rgb.z });
    const float delta = cmax - cmin;
 
    float hue = 0.F;
    if (delta > 0.F) {
        if (cmax == rgb.x) {
            hue = std::fmod((rgb.y - rgb.z) / delta, 6.F);
        } else if (cmax == rgb.y) {
            hue = (rgb.z - rgb.x) / delta + 2.F;
        } else {
            hue = (rgb.x - rgb.y) / delta + 4.F;
        }
        hue /= 6.F;
        if (hue < 0.F)
            hue += 1.F;
    }
 
    return { hue, cmax > 0.F ? delta / cmax : 0.F, cmax };
}

Referenced by MayaFlux::Portal::Forma::ColorPicker::place(), and MayaFlux::Kinesis::Vision::rgba_to_hsv().

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