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diff --git a/src/crystfelcolourscale.h b/src/crystfelcolourscale.h
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+/*
+ * crystfelcolourscale.h
+ *
+ * CrystFEL's colour scale widget
+ *
+ * Copyright © 2020-2022 Deutsches Elektronen-Synchrotron DESY,
+ *                       a research centre of the Helmholtz Association.
+ *
+ * Authors:
+ *  2020-2022 Thomas White <taw@physics.org>
+ *
+ * This file is part of CrystFEL.
+ *
+ * CrystFEL 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.
+ *
+ * CrystFEL 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 CrystFEL.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef CRYSTFELCOLOURSCALE_H
+#define CRYSTFELCOLOURSCALE_H
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "image.h"
+
+#define CRYSTFEL_TYPE_COLOUR_SCALE (crystfel_colour_scale_get_type())
+
+#define CRYSTFEL_COLOUR_SCALE(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj), \
+                                 CRYSTFEL_TYPE_COLOUR_SCALE, CrystFELColourScale))
+
+#define CRYSTFEL_IS_COLOUR_SCALE(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj), \
+                                    CRYSTFEL_TYPE_COLOUR_SCALE))
+
+#define CRYSTFEL_COLOUR_SCALE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((obj), \
+                                         CRYSTFEL_TYPE_COLOUR_SCALE, CrystFELColourScale))
+
+#define CRYSTFEL_IS_COLOUR_SCALE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((obj), \
+                                            CRYSTFEL_TYPE_COLOUR_SCALE))
+
+#define CRYSTFEL_COLOUR_SCALE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj), \
+                                           CRYSTFEL_TYPE_COLOUR_SCALE, CrystFELColourScale))
+
+
+#define COLSCALE_N_BINS (256)
+
+struct _crystfelcolourscale
+{
+	GtkDrawingArea       parent_instance;
+	double               visible_width;
+	double               visible_height;
+	double               drag_start_x;
+	double               drag_start_y;
+
+	int                  bins[COLSCALE_N_BINS];
+};
+
+struct _crystfelcolourscaleclass
+{
+	GtkDrawingAreaClass parent_class;
+};
+
+typedef struct _crystfelcolourscale CrystFELColourScale;
+typedef struct _crystfelcolourscaleclass CrystFELColourScaleClass;
+
+extern GType crystfel_colour_scale_get_type(void);
+extern GtkWidget *crystfel_colour_scale_new(void);
+
+extern void crystfel_colour_scale_scan_image(CrystFELColourScale *cs,
+                                             struct image *image);
+
+extern void crystfel_colour_scale_get_range(CrystFELColourScale *cs,
+                                            double scale_min,
+                                            double scale_max);
+
+#endif	/* CRYSTFELCOLOURSCALE_H */