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copied!<p>I don't have a code example to give but here's a way to do this. Convert each pixel from RGB to HSV and change the Hue and Saturation component on each pixel. The Hue controls the Color. The Value should stay the same. The result will be a Bitmap with the same lightness and darkness but with a different color.</p> <p>Edit: here's an example. Notice the Hue and Saturation update. </p> <pre><code> public static Color ColorFromAhsb(int a, float h, float s, float b) { if (0 > a || 255 < a) { throw new Exception("a"); } if (0f > h || 360f < h) { throw new Exception("h"); } if (0f > s || 1f < s) { throw new Exception("s"); } if (0f > b || 1f < b) { throw new Exception("b"); } if (0 == s) { return Color.FromArgb(a, Convert.ToInt32(b * 255), Convert.ToInt32(b * 255), Convert.ToInt32(b * 255)); } float fMax, fMid, fMin; int iSextant, iMax, iMid, iMin; if (0.5 < b) { fMax = b - (b * s) + s; fMin = b + (b * s) - s; } else { fMax = b + (b * s); fMin = b - (b * s); } iSextant = (int)Math.Floor(h / 60f); if (300f <= h) { h -= 360f; } h /= 60f; h -= 2f * (float)Math.Floor(((iSextant + 1f) % 6f) / 2f); if (0 == iSextant % 2) { fMid = h * (fMax - fMin) + fMin; } else { fMid = fMin - h * (fMax - fMin); } iMax = Convert.ToInt32(fMax * 255); iMid = Convert.ToInt32(fMid * 255); iMin = Convert.ToInt32(fMin * 255); switch (iSextant) { case 1: return Color.FromArgb(a, iMid, iMax, iMin); case 2: return Color.FromArgb(a, iMin, iMax, iMid); case 3: return Color.FromArgb(a, iMin, iMid, iMax); case 4: return Color.FromArgb(a, iMid, iMin, iMax); case 5: return Color.FromArgb(a, iMax, iMin, iMid); default: return Color.FromArgb(a, iMax, iMid, iMin); } } private void Form1_Load(object sender, EventArgs e) { var bmp = new Bitmap("c:\\bw.bmp"); foreach (int y in Enumerable.Range(0, bmp.Height)) { foreach (int x in Enumerable.Range(0,bmp.Width)) { var p = bmp.GetPixel(x, y); var h = p.GetHue(); var c = ColorFromAhsb(p.A, p.GetHue() + 200, p.GetSaturation() + 0.5f, p.GetBrightness()); bmp.SetPixel(x, y, c); } } pictureBox1.Image = bmp; //bmp.Dispose(); } </code></pre>

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