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    <p>HSV ( Hue / Saturation / Value ) also called HSL ( Hue / Saturation / Lightness ) is just a different color representation. </p> <p>Using this representation is it easier to adjust the brightness. So convert from RGB to HSV, brighten the 'V', then convert back to RGB.</p> <p>Below is some C code to convert </p> <pre><code>void RGBToHSV(unsigned char cr, unsigned char cg, unsigned char cb,double *ph,double *ps,double *pv) { double r,g,b; double max, min, delta; /* convert RGB to [0,1] */ r = (double)cr/255.0f; g = (double)cg/255.0f; b = (double)cb/255.0f; max = MAXx(r,(MAXx(g,b))); min = MINx(r,(MINx(g,b))); pv[0] = max; /* Calculate saturation */ if (max != 0.0) ps[0] = (max-min)/max; else ps[0] = 0.0; if (ps[0] == 0.0) { ph[0] = 0.0f; //UNDEFINED; return; } /* chromatic case: Saturation is not 0, so determine hue */ delta = max-min; if (r==max) { ph[0] = (g-b)/delta; } else if (g==max) { ph[0] = 2.0 + (b-r)/delta; } else if (b==max) { ph[0] = 4.0 + (r-g)/delta; } ph[0] = ph[0] * 60.0; if (ph[0] &lt; 0.0) ph[0] += 360.0; } void HSVToRGB(double h,double s,double v,unsigned char *pr,unsigned char *pg,unsigned char *pb) { int i; double f, p, q, t; double r,g,b; if( s == 0 ) { // achromatic (grey) r = g = b = v; } else { h /= 60; // sector 0 to 5 i = (int)floor( h ); f = h - i; // factorial part of h p = v * ( 1 - s ); q = v * ( 1 - s * f ); t = v * ( 1 - s * ( 1 - f ) ); switch( i ) { case 0: r = v; g = t; b = p; break; case 1: r = q; g = v; b = p; break; case 2: r = p; g = v; b = t; break; case 3: r = p; g = q; b = v; break; case 4: r = t; g = p; b = v; break; default: // case 5: r = v; g = p; b = q; break; } } r*=255; g*=255; b*=255; pr[0]=(unsigned char)r; pg[0]=(unsigned char)g; pb[0]=(unsigned char)b; } </code></pre>
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    1. POHow do I determine darker or lighter color variant of a given color?
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    1. USKPexEA
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      1. VTUpMod
    2. VO
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    1. CO[HSV and HSL are different things](http://en.wikipedia.org/wiki/HSL_and_HSV). HSV is **not** also called HSL.
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      1. USRoman Starkov
    2. COBut HSV is sometimes called HSB (brightness). Which is still different to HSL, as @romkyns says.
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      1. USMark Embling
    3. CO@KPexEA you wrote "So convert from RGB to HSV, brighten the 'V', then convert back to RGB." . How do I do the *brightening the `V` portion`?I need to generate `n` shades of the same color. The shades should be increasingly brighter.
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      1. USGeek
 

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