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diff --git a/frontend/xsane-gamma.h b/frontend/xsane-gamma.h
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-/* xsane -- a graphical (X11, gtk) scanner-oriented SANE frontend
-
- xsane-gamma.h
-
- Oliver Rauch <Oliver.Rauch@Wolfsburg.DE>
- Copyright (C) 1998-2000 Oliver Rauch
- This file is part of the XSANE package.
-
- 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. */
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-#include <sane/sane.h>
-
-/* ---------------------------------------------------------------------------------------------------------------------- */
-
-extern void xsane_clear_histogram(XsanePixmap *hist);
-extern void xsane_draw_slider_level(XsaneSlider *slider);
-extern void xsane_update_slider(XsaneSlider *slider);
-extern void xsane_update_sliders(void);
-extern void xsane_create_slider(XsaneSlider *slider);
-extern void xsane_create_histogram(GtkWidget *parent, const char *title, int width, int height, XsanePixmap *hist);
-extern void xsane_calculate_histogram(void);
-extern void xsane_update_histogram(void);
-extern void xsane_histogram_toggle_button_callback(GtkWidget *widget, gpointer data);
-extern void xsane_create_gamma_curve(SANE_Int *gammadata, int negative, double gamma,
- double brightness, double contrast, int numbers, int maxout);
-extern void xsane_update_gamma(void);
-extern void xsane_enhancement_by_gamma(void);
-extern void xsane_enhancement_restore_default(void);
-extern void xsane_enhancement_restore(void);
-extern void xsane_enhancement_store(void);
-extern void xsane_enhancement_by_histogram(void);
-extern void xsane_create_histogram_dialog(const char *devicetext);
-
-/* ---------------------------------------------------------------------------------------------------------------------- */