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
53
54
55
56
57
58
|
/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef __LEVELS_H__
#define __LEVELS_H__
struct _Levels
{
gdouble gamma[5];
gint low_input[5];
gint high_input[5];
gint low_output[5];
gint high_output[5];
guchar input[5][256]; /* this is used only by the gui */
};
void levels_init (Levels *levels);
void levels_channel_reset (Levels *levels,
GimpHistogramChannel channel);
void levels_stretch (Levels *levels,
GimpHistogram *hist,
gboolean is_color);
void levels_channel_stretch (Levels *levels,
GimpHistogram *hist,
GimpHistogramChannel channel);
void levels_adjust_by_colors (Levels *levels,
GimpHistogramChannel channel,
guchar *black,
guchar *gray,
guchar *white);
void levels_calculate_transfers (Levels *levels);
gfloat levels_lut_func (Levels *levels,
gint n_channels,
gint channel,
gfloat value);
#endif /* __LEVELS_H__ */
|
