/usr/include/gimp-2.0/libgimp/gimpconvert_pdb.h is in libgimp2.0-dev 2.8.10-0ubuntu1.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | /* LIBGIMP - The GIMP Library
 * Copyright (C) 1995-2003 Peter Mattis and Spencer Kimball
 *
 * gimpconvert_pdb.h
 *
 * This library is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.  If not, see
 * <http://www.gnu.org/licenses/>.
 */
/* NOTE: This file is auto-generated by pdbgen.pl */
#if !defined (__GIMP_H_INSIDE__) && !defined (GIMP_COMPILATION)
#error "Only <libgimp/gimp.h> can be included directly."
#endif
#ifndef __GIMP_CONVERT_PDB_H__
#define __GIMP_CONVERT_PDB_H__
G_BEGIN_DECLS
/* For information look into the C source or the html documentation */
gboolean gimp_image_convert_rgb               (gint32                  image_ID);
gboolean gimp_image_convert_grayscale         (gint32                  image_ID);
gboolean gimp_image_convert_indexed           (gint32                  image_ID,
                                               GimpConvertDitherType   dither_type,
                                               GimpConvertPaletteType  palette_type,
                                               gint                    num_cols,
                                               gboolean                alpha_dither,
                                               gboolean                remove_unused,
                                               const gchar            *palette);
gboolean gimp_image_convert_set_dither_matrix (gint                    width,
                                               gint                    height,
                                               gint                    matrix_length,
                                               const guint8           *matrix);
G_END_DECLS
#endif /* __GIMP_CONVERT_PDB_H__ */
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