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diff --git a/frontend/pisa_change_unit.h b/frontend/pisa_change_unit.h
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+/* 
+   SANE EPSON backend
+   Copyright (C) 2001, 2005 SEIKO EPSON CORPORATION
+
+   This file is part of the `iscan' program.
+
+   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 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+   As a special exception, the copyright holders give permission
+   to link the code of this program with the esmod library and
+   distribute linked combinations including the two.  You must obey
+   the GNU General Public License in all respects for all of the
+   code used other then esmod.
+*/
+
+#ifndef ___PISA_CHANGE_UNIT_H
+#define ___PISA_CHANGE_UNIT_H
+
+double inches_reflect_zoom ( double inch, long zoom );
+double inch2centi ( double inch, long zoom = 100 );
+
+// Convenience API to convert dimensions to pixels the same way as the
+// epkowa backend does.
+
+long inch2width  (double inch, long resolution, long zoom = 100,
+		  bool monochrome = false);
+long inch2height (double inch, long resolution, long zoom = 100);
+long inch2pixel  (double inch, long resolution, long zoom = 100);
+long inch2pixel  (bool is_width,
+		  double inch, long resolution, long zoom = 100);
+
+long centi2width  (double centi, long resolution, long zoom = 100);
+long centi2height (double centi, long resolution, long zoom = 100);
+long centi2pixel  (double centi, long resolution, long zoom = 100);
+long centi2pixel  (bool is_width,
+		   double centi, long resolution, long zoom = 100);
+
+#endif // ___PISA_CHANGE_UNIT_H