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diff --git a/xicc/bt1886.h b/xicc/bt1886.h
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+#ifndef BT1886_H
+#define BT1886_H
+
+/* 
+ * Author:  Graeme W. Gill
+ * Date:    16/8/13
+ * Version: 1.00
+ *
+ * Copyright 2013, 2014 Graeme W. Gill
+ * All rights reserved.
+ *
+ * This material is licenced under the GNU AFFERO GENERAL PUB LICENSE Version 3 :-
+ * see the License.txt file for licencing details.
+ *
+ */
+
+/* BT.1886 stype input offset transfer curve, */
+/* + general gamma + input + output offset curve support. */
+
+
+typedef struct {
+	icmXYZNumber w;				/* White point for Lab conversion */
+	double ingo;				/* input Y offset for bt1886 */
+	double outsc;				/* output Y scale for bt1886 */
+	double outo;				/* output Y offset */
+	double outL;				/* output black point L value */
+	double tab[2];				/* Target ab offset value at zero input for bt1886 */
+	double gamma;				/* bt.1886 technical gamma to apply */
+} bt1886_info;
+
+/* Set the bt1886_info to a default do nothing state */
+void bt1886_setnop(bt1886_info *p);
+
+/* Setup the bt1886_info for the given target */
+void bt1886_setup(
+bt1886_info *p,
+icmXYZNumber *w,	/* wp used for L*a*b* conversion */
+double *XYZbp,		/* normalised bp used for black offset and black point hue "bend" */
+double outoprop,	/* 0..1 proportion of output black point compensation */
+double gamma,		/* technical or effective gamma */
+int effg			/* nz if effective gamma, z if technical gamma */
+);
+
+/* Apply BT.1886 eotf curve to the device RGB value */
+/* to produce a linear light RGB. We pass xvYCC out of range values through. */
+void bt1886_fwd_curve(bt1886_info *p, double *out, double *in);
+
+/* Apply BT.1886 processing black point hue adjustment to the XYZ value */
+void bt1886_wp_adjust(bt1886_info *p, double *out, double *in);
+
+
+/* Apply inverse BT.1886 eotf curve to the device RGB value */
+/* to produce a linear light RGB. We pass xvYCC out of range values through. */
+void bt1886_bwd_curve(bt1886_info *p, double *out, double *in);
+
+/* Apply inverse BT.1886 processing black point hue adjustment to the XYZ value */
+void bt1886_inv_wp_adjust(bt1886_info *p, double *out, double *in);
+
+#endif /* BT1886_H */
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