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diff --git a/src/gamma.h b/src/gamma.h
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+/**
+ * crt-calibrator – Calibration utility for CRT monitors
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * 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 CRT_CALIBRATOR_GAMMA_H
+#define CRT_CALIBRATOR_GAMMA_H
+
+
+#include <stddef.h>
+#include <stdint.h>
+
+
+/**
+ * Analyse a gamma ramp
+ * 
+ * @param  stops       The number of stops in the gamma ramp
+ * @param  ramp        The gamma ramp
+ * @param  gamma       Output parameter for the gamma
+ * @param  contrast    Output parameter for the contrast
+ * @param  brightness  Output parameter for the brightness
+ */
+void gamma_analyse(size_t stops, const uint16_t* restrict ramp, double* restrict gamma,
+		   double* restrict contrast, double* restrict brightness);
+
+/**
+ * Generate a gamma ramp
+ * 
+ * @param  stops       The number of stops in the gamma ramp
+ * @param  ramp        Memory area to where to write the gamma ramp
+ * @param  gamma       The gamma
+ * @param  contrast    The contrast
+ * @param  brightness  The brightness
+ */
+void gamma_generate(size_t stops, uint16_t* restrict ramp, double gamma,
+		    double contrast, double brightness);
+
+
+#endif
+