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POHSV / RGB color space conversion
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copied!<p>I found this code in this forum but Im having doubts with the code. </p> <ol> <li><p>in this code snippet "int hi = Convert.ToInt32(Math.Floor(hue / 60)) % 6;" why the complete answer is modulus by 6? (%6)</p></li> <li><p>why is " value = value * 255 " value is multiplied by 255? </p> <p>im reffering to this research paper (p-15 , p-16) and same algorithmic is discussed but I found these differences. </p> <p><a href="http://www.poynton.com/PDFs/coloureq.pdf" rel="nofollow">http://www.poynton.com/PDFs/coloureq.pdf</a></p> <pre><code>public static Color ColorFromHSV(double hue, double saturation, double value) { int hi = Convert.ToInt32(Math.Floor(hue / 60)) % 6; double f = hue / 60 - Math.Floor(hue / 60); value = value * 255; int v = Convert.ToInt32(value); int p = Convert.ToInt32(value * (1 - saturation)); int q = Convert.ToInt32(value * (1 - f * saturation)); int t = Convert.ToInt32(value * (1 - (1 - f) * saturation)); if (hi == 0) return Color.FromArgb(255, v, t, p); else if (hi == 1) return Color.FromArgb(255, q, v, p); else if (hi == 2) return Color.FromArgb(255, p, v, t); else if (hi == 3) return Color.FromArgb(255, p, q, v); else if (hi == 4) return Color.FromArgb(255, t, p, v); else return Color.FromArgb(255, v, p, q); } public void convertToHSV(Color color, out double hue, out double saturation, out double value) { int max = Math.Max(color.R, Math.Max(color.G, color.B)); int min = Math.Min(color.R, Math.Min(color.G, color.B)); hue = color.GetHue(); saturation = (max == 0) ? 0 : 1d - (1d * min / max); value = max / 255d; } </code></pre></li> </ol>

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