GameProgrammerArt

Math

C/C++

pixeltype RGBtoHSV(pixeltype palette_color){
	//0.0f <= r <= 1.0f
	//0.0f <= g <= 1.0f
	//0.0f <= b <= 1.0f
    double r = (double)(RED_OF(palette_color));
    double g = (double)(GREEN_OF(palette_color));
    double b = (double)(BLUE_OF(palette_color));
    double max, min, h, s, v;

	if(r > g){
		max = r;
	}else{
		max = g;
	}
	if(b > max){
		max = b;
	}

	if(r < g){
		min = r;
	}else{
		min = g;
	}
	if(b < min){
		min = b;
	}

    if(max == min){
        h = 0.0f;
    }else if(max == r){
        h = ((60.0f * ((g - b) / (max - min)) + 360) % 360.0f);
    }else if(max == g){
        h = ((60.0f * ((b - r) / (max - min)) + 120));
    }else if(max == b){
        h = ((60.0f * ((r - g) / (max - min)) + 240));
    }

    if(max == 0){
        s = 0.0f;
    }else{
        s = 1.0f - (min / max);
    }
    v = max;

	//0.0f <= h <= 360.0f
	//0.0f <= s <= 1.0f
	//0.0f <= v <= 1.0f
    return HSV_OF(h, s, v);
}

Tags: c++, color space, Conversion, Convert, convert rgb to hsv, hsv, math, Programming, rendering, RGB

This entry was posted on Monday, November 23rd, 2009 at 9:46 pm and is filed under Blog_category. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.