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copied!<p>Here's my version on how to do that (in C, sorry, but shouldn't be hard to convert, just replace the <code>int *</code>'s and <code>double *</code>'s with <code>out</code> or <code>ref</code> ints, and don't use pointer syntax)</p> <pre><code>void colorlib_hsbtorgb(double hue, double saturation, double brightness, int *red, int *green, int *blue) { if (saturation == 0) { *red = *green = *blue = brightness; } else { // the color wheel consists of 6 sectors. Figure out which sector you're in. double sectorPos = hue / 60.0; int sectorNumber = (int)(floor(sectorPos)); // get the fractional part of the sector double fractionalSector = sectorPos - sectorNumber; // calculate values for the three axes of the color. double p = brightness * (1.0 - saturation); double q = brightness * (1.0 - (saturation * fractionalSector)); double t = brightness * (1.0 - (saturation * (1 - fractionalSector))); // assign the fractional colors to r, g, and b based on the sector the angle is in. switch (sectorNumber) { case 0: *red = brightness; *green = t; *blue = p; break; case 1: *red = q; *green = brightness; *blue = p; break; case 2: *red = p; *green = brightness; *blue = t; break; case 3: *red = p; *green = q; *blue = brightness; break; case 4: *red = t; *green = p; *blue = brightness; break; case 5: *red = brightness; *green = p; *blue = q; break; } } } </code></pre> <p>RGB to hsb:</p> <pre><code>void colorlib_rgbtohsb(int red, int green, int blue, double *hue, double *saturation, double *brightness) { double dRed = red / 255; double dGreen = green / 255; double dBlue = blue / 255; double max = fmax(dRed, fmax(dGreen, dBlue)); double min = fmin(dRed, fmin(dGreen, dBlue)); double h = 0; if (max == dRed && dGreen >= dBlue) { h = 60 * (dGreen - dBlue) / (max - min); } else if (max == dRed && dGreen < dBlue) { h = 60 * (dGreen - dBlue) / (max - min) + 360; } else if (max == dGreen) { h = 60 * (dBlue - dRed) / (max - min) + 120; } else if (max == dBlue) { h = 60 * (dRed - dGreen) / (max - min) + 240; } double s = (max == 0) ? 0.0 : (1.0 - (min / max)); *hue = h; *saturation = s; *brightness = max; } </code></pre> <p>If I find my code in C#, I will edit this answer....</p>

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