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diff --git a/src/libcolour.h b/src/libcolour.h
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+/**
+ * Copyright © 2016  Mattias Andrée <maandree@kth.se>
+ * 
+ * This program 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 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef LIBCOLOUR_H
+#define LIBCOLOUR_H
+
+
+
+union libcolour_colour;
+
+
+typedef enum libcolour_model {
+  LIBCOLOUR_RGB,
+  LIBCOLOUR_SRGB,
+  LIBCOLOUR_CIEXYY,
+  LIBCOLOUR_CIEXYZ,
+  LIBCOLOUR_CIELAB,
+  LIBCOLOUR_CIELUV,
+  LIBCOLOUR_CIELCH,
+  LIBCOLOUR_YIQ,
+  LIBCOLOUR_YDBDR,
+  LIBCOLOUR_YUV,
+  LIBCOLOUR_YPBPR,
+  LIBCOLOUR_YCGCO,
+  LIBCOLOUR_CIE1960UCS,
+  LIBCOLOUR_CIEUVW
+} libcolour_model_t;
+
+
+typedef enum libcolour_rgb_colour_space {
+} libcolour_rgb_colour_space_t;
+
+
+typedef struct libcolour_rgb {
+  enum libcolour_model model;
+  double R;
+  double G;
+  double B;
+  int with_gamma;
+  int regular_gamma;
+  double gamma;
+  union libcolour_colour red;
+  union libcolour_colour green;
+  union libcolour_colour blue;
+  union libcolour_colour white;
+  double (*to_encoded_red)(double);
+  double (*to_decoded_red)(double);
+  double (*to_encoded_green)(double);
+  double (*to_decoded_green)(double);
+  double (*to_encoded_blue)(double);
+  double (*to_decoded_blue)(double);
+  double M[3][3];
+  double Minv[3][3];
+  enum libcolour_rgb_colour_space colour_space;
+} libcolour_srgb_t;
+
+typedef struct libcolour_srgb {
+  enum libcolour_model model;
+  double R;
+  double G;
+  double B;
+  int with_gamma;
+} libcolour_srgb_t;
+
+typedef struct libcolour_ciexyy {
+  enum libcolour_model model;
+  double x;
+  double y;
+  double Y;
+} libcolour_ciexyy_t;
+
+typedef struct libcolour_ciexyz {
+  enum libcolour_model model;
+  double X;
+  double Y;
+  double Z;
+} libcolour_ciexyz_t;
+
+typedef struct libcolour_cielab {
+  enum libcolour_model model;
+  double L;
+  double a;
+  double n;
+} libcolour_cielab_t;
+
+typedef struct libcolour_cieluv {
+  enum libcolour_model model;
+  double L;
+  double u;
+  double v;
+  union libcolour_colour white;
+} libcolour_cieluv_t;
+
+typedef struct libcolour_cielch {
+  enum libcolour_model model;
+  double L;
+  double C;
+  double h;
+  union libcolour_colour white;
+} libcolour_cielch_t;
+
+typedef struct libcolour_yiq {
+  enum libcolour_model model;
+  double Y;
+  double I;
+  double Q;
+} libcolour_yiq_t;
+
+typedef struct libcolour_ydbdr {
+  enum libcolour_model model;
+  double Y;
+  double Db;
+  double Dr;
+} libcolour_ydbdr_t;
+
+typedef struct libcolour_yuv {
+  enum libcolour_model model;
+  double Y;
+  double U;
+  double V;
+} libcolour_yuv_t;
+
+typedef struct libcolour_ypbpr {
+  enum libcolour_model model;
+  double Y;
+  double Pb;
+  double Pr;
+} libcolour_ypbpr_t;
+
+typedef struct libcolour_ycgco {
+  enum libcolour_model model;
+  double Y;
+  double Cg;
+  double Co;
+} libcolour_ycgco_t;
+
+typedef struct libcolour_cie1960ucs {
+  enum libcolour_model model;
+  double u;
+  double v;
+  double Y;
+} libcolour_cie1960ucs_t;
+
+typedef struct libcolour_cieuvw {
+  enum libcolour_model model;
+  double U;
+  double V;
+  double W;
+  double u0;
+  double v0;
+} libcolour_cieuvw_t;
+
+
+typedef union libcolour_colour {
+  enum libcolour_model model;
+  struct libcolour_rgb rgb;
+  struct libcolour_srgb srgb;
+  struct libcolour_ciexyy ciexyy;
+  struct libcolour_ciexyz ciexyz;
+  struct libcolour_cielab cielab;
+  struct libcolour_cieluv cieluv;
+  struct libcolour_cielch cielch;
+  struct libcolour_yiq yiq;
+  struct libcolour_ydbdr ydbdr;
+  struct libcolour_yuv yuv;
+  struct libcolour_ypbpr ypbpr;
+  struct libcolour_ycgco ycgco;
+  struct libcolour_cie1960ucs cie1960ucs;
+  struct libcolour_cieuvw cieuvw;
+} libcolour_colour_t;
+
+
+
+int libcolour_convert(const libcolour_colour_t* restrict from, libcolour_colour_t* restrict to);
+double libcolour_srgb_encode(double);
+double libcolour_srgb_decode(double);
+int libcolour_delta_e(const libcolour_colour_t*, const libcolour_colour_t*, double*);
+int libcolour_proper(libcolour_colour_t*);
+
+
+
+#endif
+