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diff --git a/graphics/epix/Color_RGB.cc b/graphics/epix/Color_RGB.cc
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+++ b/graphics/epix/Color_RGB.cc
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+/*
+ * Color_RGB.cc -- ePiX::RGB_Color
+ *
+ * This file is part of ePiX, a C++ library for creating high-quality
+ * figures in LaTeX
+ *
+ * Version 1.1.17
+ *
+ * Last Change: September 13, 2007
+ */
+
+/*
+ * Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
+ * Andrew D. Hwang <rot 13 nujnat at zngupf dot ubylpebff dot rqh>
+ * Department of Mathematics and Computer Science
+ * College of the Holy Cross
+ * Worcester, MA, 01610-2395, USA
+ *
+ */
+ 
+/*
+ * ePiX is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * ePiX is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with ePiX; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <sstream>
+#include <string>
+#include <vector>
+
+#include <cmath>
+
+#include "functions.h"
+
+#include "Color_Utils.h"
+#include "Color_RGB.h"
+
+namespace ePiX {
+
+  RGB_Color::RGB_Color(double r, double g, double b)
+    : red(make_r(r, g, b)), green(make_g(r, g, b)), blue(make_b(r, g, b)) { }
+
+
+  RGB_Color::RGB_Color(const RGB_Densities& s)
+    : red(s.m_dens_red), green(s.m_dens_green), blue(s.m_dens_blue) { }
+
+  Color_Base::RGB_Densities RGB_Color::to_rgb() const
+  {
+    return Color_Base::RGB_Densities(red, green, blue);
+  }
+
+  RGB_Color* RGB_Color::clone() const
+  {
+    return new RGB_Color(*this);
+  }
+
+
+  RGB_Color& RGB_Color::filter(const Color_Base& color)
+  {
+    Color_Base::RGB_Densities s(color.to_rgb());
+
+    red   = min(red,   s.m_dens_red);
+    green = min(green, s.m_dens_green);
+    blue  = min(blue,  s.m_dens_blue);
+
+    return *this;
+  }
+
+  RGB_Color& RGB_Color::operator*= (double c)
+  {
+    double r(red*c);
+    double g(green*c);
+    double b(blue*c);
+
+    red   = make_r(r, g, b);
+    green = make_g(r, g, b);
+    blue  = make_b(r, g, b);
+
+    return *this;
+  }
+
+  RGB_Color& RGB_Color::blend(const Color_Base& color, double d)
+  {
+    Color_Base::RGB_Densities s(color.to_rgb());
+    double wt(clip_to_unit(d));
+
+    red   += wt*(s.m_dens_red   - red);
+    green += wt*(s.m_dens_green - green);
+    blue  += wt*(s.m_dens_blue  - blue);
+
+    return *this;
+  }
+
+  RGB_Color& RGB_Color::superpose(const Color_Base& color)
+  {
+    Color_Base::RGB_Densities s(color.to_rgb());
+
+    red   = clip_to_unit(red   + s.m_dens_red);
+    green = clip_to_unit(green + s.m_dens_green);
+    blue  = clip_to_unit(blue  + s.m_dens_blue);
+
+    return *this;
+  }
+
+  RGB_Color& RGB_Color::invert()
+  {
+    red   = 1 - red;
+    green = 1 - green;
+    blue  = 1 - blue;
+
+    return *this;
+  }
+
+  std::string RGB_Color::model() const
+  {
+    return "rgb";
+  }
+
+  std::string RGB_Color::name() const
+  {
+    std::ostringstream nm;
+
+    nm << "rgb_" << dtohex(red) << dtohex(green) << dtohex(blue);
+
+    return nm.str();
+  }
+
+  std::vector<double> RGB_Color::densities() const
+  {
+    std::vector<double> val(3);
+    val.at(0) = rd(red);
+    val.at(1) = rd(green);
+    val.at(2) = rd(blue);
+    return val;
+  }
+} // end of namespace