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diff --git a/include/sane/sanei_magic.h b/include/sane/sanei_magic.h
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+/* sane - Scanner Access Now Easy.
+ 
+   Copyright (C) 2009 m. allan noah
+
+   This file is part of the SANE package.
+
+   SANE 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.
+
+   SANE 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 sane; see the file COPYING.  If not, write to the Free
+   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+   As a special exception, the authors of SANE give permission for
+   additional uses of the libraries contained in this release of SANE.
+
+   The exception is that, if you link a SANE library with other files
+   to produce an executable, this does not by itself cause the
+   resulting executable to be covered by the GNU General Public
+   License.  Your use of that executable is in no way restricted on
+   account of linking the SANE library code into it.
+
+   This exception does not, however, invalidate any other reasons why
+   the executable file might be covered by the GNU General Public
+   License.
+
+   If you submit changes to SANE to the maintainers to be included in
+   a subsequent release, you agree by submitting the changes that
+   those changes may be distributed with this exception intact.
+
+   If you write modifications of your own for SANE, it is your choice
+   whether to permit this exception to apply to your modifications.
+   If you do not wish that, delete this exception notice.
+*/
+
+/** @file sanei_magic.h
+ * This file provides an interface to simple image post-processing functions
+ *
+ * Currently, three operations are provided:
+ * - Deskew (correct rotated scans, by detecting media edges)
+ * - Autocrop (reduce image size to minimum rectangle containing media)
+ * - Despeckle (replace dots of significantly different color with background)
+ *
+ * Note that these functions are simplistic, and are expected to change.
+ * Patches and suggestions are welcome.
+ */
+
+#ifndef SANEI_MAGIC_H
+#define SANEI_MAGIC_H
+
+/** Initialize sanei_magic.
+ *
+ * Call this before any other sanei_magic function.
+ */
+extern void sanei_magic_init( void );
+
+/** Update the image buffer, replacing dots with surrounding background color
+ *
+ * @param params describes image
+ * @param buffer contains image data
+ * @param diam maximum dot diameter to remove
+ *
+ * @return
+ * - SANE_STATUS_GOOD - success
+ * - SANE_STATUS_INVAL - invalid image parameters
+ */
+extern SANE_Status
+sanei_magic_despeck (SANE_Parameters * params, SANE_Byte * buffer,
+  SANE_Int diam);
+
+/** Find the skew of the media inside the image, via edge detection.
+ *
+ * @param params describes image
+ * @param buffer contains image data
+ * @param dpiX horizontal resolution
+ * @param dpiY vertical resolution
+ * @param[out] centerX horizontal coordinate of center of rotation
+ * @param[out] centerY vertical coordinate of center of rotation
+ * @param[out] finSlope slope of rotation
+ *
+ * @return
+ * - SANE_STATUS_GOOD - success
+ * - SANE_STATUS_NO_MEM - not enough memory
+ * - SANE_STATUS_INVAL - invalid image parameters
+ * - SANE_STATUS_UNSUPPORTED - slope angle too shallow to detect
+ */
+extern SANE_Status
+sanei_magic_findSkew(const SANE_Parameters * params, const SANE_Byte * buffer,
+  int dpiX, int dpiY, int * centerX, int * centerY, double * finSlope);
+
+/** Correct the skew of the media inside the image, via simple rotation
+ *
+ * @param params describes image
+ * @param buffer contains image data
+ * @param centerX horizontal coordinate of center of rotation
+ * @param centerY vertical coordinate of center of rotation
+ * @param slope slope of rotation
+ * @param bg_color the replacement color for edges exposed by rotation
+ *
+ * @return
+ * - SANE_STATUS_GOOD - success
+ * - SANE_STATUS_NO_MEM - not enough memory
+ * - SANE_STATUS_INVAL - invalid image parameters
+ */
+extern SANE_Status
+sanei_magic_rotate (SANE_Parameters * params, SANE_Byte * buffer,
+  int centerX, int centerY, double slope, int bg_color);
+
+/** Find the edges of the media inside the image, parallel to image edges
+ *
+ * @param params describes image
+ * @param buffer contains image data
+ * @param dpiX horizontal resolution
+ * @param dpiY vertical resolution
+ * @param[out] top vertical offset to upper edge of media
+ * @param[out] bot vertical offset to lower edge of media
+ * @param[out] left horizontal offset to left edge of media
+ * @param[out] right horizontal offset to right edge of media
+ *
+ * @return
+ * - SANE_STATUS_GOOD - success
+ * - SANE_STATUS_NO_MEM - not enough memory
+ * - SANE_STATUS_UNSUPPORTED - edges could not be detected
+ */
+extern SANE_Status
+sanei_magic_findEdges(const SANE_Parameters * params, const SANE_Byte * buffer,
+  int dpiX, int dpiY, int * top, int * bot, int * left, int * right);
+
+/** Crop the image, parallel to image edges
+ *
+ * @param params describes image
+ * @param buffer contains image data
+ * @param top vertical offset to upper edge of crop
+ * @param bot vertical offset to lower edge of crop
+ * @param left horizontal offset to left edge of crop 
+ * @param right horizontal offset to right edge of crop
+ *
+ * @return
+ * - SANE_STATUS_GOOD - success
+ * - SANE_STATUS_NO_MEM - not enough memory
+ * - SANE_STATUS_INVAL - invalid image parameters
+ */
+extern SANE_Status
+sanei_magic_crop(SANE_Parameters * params, SANE_Byte * buffer,
+  int top, int bot, int left, int right);
+
+#endif /* SANEI_MAGIC_H */