mirror of https://github.com/GNOME/gimp.git
303 lines
7.2 KiB
C
303 lines
7.2 KiB
C
/* Color Enhance 0.10 --- image filter plug-in for The Gimp image
|
|
* manipulation program
|
|
*
|
|
* Copyright (C) 1999 Martin Weber
|
|
* Copyright (C) 1996 Federico Mena Quintero
|
|
*
|
|
* You can contact me at martweb@gmx.net
|
|
* You can contact the original The Gimp authors at gimp@xcf.berkeley.edu
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/* This simple plug-in does an automatic Saturation stretch. For each
|
|
channel in the image, it finds the minimum and maximum values... it
|
|
uses those values to stretch the individual histograms to the full
|
|
range. For some images it may do just what you want; for others
|
|
it may not work that well. This version operates in HSV space
|
|
and preserves hue. Most code is taken from autostretch_hsv */
|
|
|
|
|
|
#include "config.h"
|
|
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
|
|
#include <libgimp/gimp.h>
|
|
|
|
#include "libgimp/stdplugins-intl.h"
|
|
|
|
static GimpRunMode run_mode;
|
|
|
|
/* Declare local functions.
|
|
*/
|
|
static void query (void);
|
|
static void run (const gchar *name,
|
|
gint nparams,
|
|
const GimpParam *param,
|
|
gint *nreturn_vals,
|
|
GimpParam **return_vals);
|
|
|
|
static void Color_Enhance (GimpDrawable *drawable);
|
|
static void indexed_Color_Enhance (gint32 image_ID);
|
|
|
|
|
|
GimpPlugInInfo PLUG_IN_INFO =
|
|
{
|
|
NULL, /* init_proc */
|
|
NULL, /* quit_proc */
|
|
query, /* query_proc */
|
|
run, /* run_proc */
|
|
};
|
|
|
|
|
|
MAIN ()
|
|
|
|
static void
|
|
query (void)
|
|
{
|
|
static GimpParamDef args[] =
|
|
{
|
|
{ GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" },
|
|
{ GIMP_PDB_IMAGE, "image", "Input image" },
|
|
{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" }
|
|
};
|
|
|
|
gimp_install_procedure ("plug_in_color_enhance",
|
|
"Automatically stretch the saturation of the "
|
|
"specified drawable to cover all possible ranges.",
|
|
"This simple plug-in does an automatic saturation "
|
|
"stretch. For each channel in the image, it finds "
|
|
"the minimum and maximum values... it uses those "
|
|
"values to stretch the individual histograms to the "
|
|
"full range. For some images it may do just what "
|
|
"you want; for others it may not work that well. "
|
|
"This version differs from Contrast Autostretch in "
|
|
"that it works in HSV space, and preserves hue.",
|
|
"Martin Weber",
|
|
"Martin Weber",
|
|
"1997",
|
|
N_("_Color Enhance"),
|
|
"RGB*, INDEXED*",
|
|
GIMP_PLUGIN,
|
|
G_N_ELEMENTS (args), 0,
|
|
args, NULL);
|
|
|
|
gimp_plugin_menu_register ("plug_in_color_enhance",
|
|
N_("<Image>/Layer/Colors/Auto"));
|
|
}
|
|
|
|
static void
|
|
run (const gchar *name,
|
|
gint nparams,
|
|
const GimpParam *param,
|
|
gint *nreturn_vals,
|
|
GimpParam **return_vals)
|
|
{
|
|
static GimpParam values[1];
|
|
GimpDrawable *drawable;
|
|
GimpPDBStatusType status = GIMP_PDB_SUCCESS;
|
|
|
|
gint32 image_ID;
|
|
|
|
INIT_I18N();
|
|
|
|
run_mode = param[0].data.d_int32;
|
|
|
|
/* Get the specified drawable */
|
|
drawable = gimp_drawable_get (param[2].data.d_drawable);
|
|
image_ID = param[1].data.d_image;
|
|
|
|
/* Make sure that the drawable is gray or RGB color */
|
|
if (gimp_drawable_is_rgb (drawable->drawable_id) ||
|
|
gimp_drawable_is_gray (drawable->drawable_id))
|
|
{
|
|
gimp_progress_init (_("Color Enhance..."));
|
|
gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1));
|
|
Color_Enhance (drawable);
|
|
|
|
if (run_mode != GIMP_RUN_NONINTERACTIVE)
|
|
gimp_displays_flush ();
|
|
}
|
|
else if (gimp_drawable_is_indexed (drawable->drawable_id))
|
|
{
|
|
indexed_Color_Enhance (image_ID);
|
|
|
|
if (run_mode != GIMP_RUN_NONINTERACTIVE)
|
|
gimp_displays_flush ();
|
|
}
|
|
else
|
|
{
|
|
status = GIMP_PDB_EXECUTION_ERROR;
|
|
}
|
|
|
|
*nreturn_vals = 1;
|
|
*return_vals = values;
|
|
|
|
values[0].type = GIMP_PDB_STATUS;
|
|
values[0].data.d_status = status;
|
|
|
|
gimp_drawable_detach (drawable);
|
|
}
|
|
|
|
static gdouble
|
|
get_v (const guchar *src)
|
|
{
|
|
gdouble h, z, v;
|
|
gint c, m, y;
|
|
gint k;
|
|
guchar map[3];
|
|
|
|
c = 255 - src[0];
|
|
m = 255 - src[1];
|
|
y = 255 - src[2];
|
|
|
|
k = c;
|
|
if (m < k) k = m;
|
|
if (y < k) k = y;
|
|
|
|
map[0] = c - k;
|
|
map[1] = m - k;
|
|
map[2] = y - k;
|
|
|
|
gimp_rgb_to_hsv4(map, &h, &z, &v);
|
|
|
|
return v;
|
|
}
|
|
|
|
static void
|
|
enhance_it (const guchar *src, guchar *dest, gdouble vlo, gdouble vhi)
|
|
{
|
|
gdouble h, z, v;
|
|
gint c, m, y;
|
|
gint k;
|
|
guchar map[3];
|
|
|
|
c = 255 - src[0];
|
|
m = 255 - src[1];
|
|
y = 255 - src[2];
|
|
|
|
k = c;
|
|
if (m < k) k = m;
|
|
if (y < k) k = y;
|
|
|
|
map[0] = c - k;
|
|
map[1] = m - k;
|
|
map[2] = y - k;
|
|
|
|
gimp_rgb_to_hsv4(map, &h, &z, &v);
|
|
|
|
if (vhi != vlo)
|
|
v = (v - vlo) / (vhi - vlo);
|
|
|
|
gimp_hsv_to_rgb4(map, h, z, v);
|
|
|
|
c = map[0];
|
|
m = map[1];
|
|
y = map[2];
|
|
|
|
c += k;
|
|
if (c > 255) c = 255;
|
|
m += k;
|
|
if (m > 255) m = 255;
|
|
y += k;
|
|
if (y > 255) y = 255;
|
|
|
|
dest[0] = 255 - c;
|
|
dest[1] = 255 - m;
|
|
dest[2] = 255 - y;
|
|
}
|
|
|
|
static void
|
|
indexed_Color_Enhance (gint32 image_ID)
|
|
{
|
|
guchar *cmap;
|
|
gint ncols,i;
|
|
gdouble vhi = 0.0, vlo = 1.0;
|
|
|
|
cmap = gimp_image_get_cmap (image_ID, &ncols);
|
|
|
|
if (!cmap)
|
|
{
|
|
printf("Color_Enhance: cmap was NULL! Quitting...\n");
|
|
gimp_quit();
|
|
}
|
|
|
|
for (i = 0; i < ncols; i++)
|
|
{
|
|
gdouble v = get_v (&cmap[3 * i]);
|
|
|
|
if (v > vhi) vhi = v;
|
|
if (v < vlo) vlo = v;
|
|
}
|
|
|
|
for (i = 0; i < ncols; i++)
|
|
{
|
|
enhance_it (&cmap[3 * i], &cmap[3 * i], vlo, vhi);
|
|
}
|
|
|
|
gimp_image_set_cmap (image_ID, cmap, ncols);
|
|
}
|
|
|
|
typedef struct {
|
|
gdouble vhi;
|
|
gdouble vlo;
|
|
gboolean has_alpha;
|
|
} ColorEnhanceParam_t;
|
|
|
|
static void
|
|
find_vhi_vlo (const guchar *src,
|
|
gint bpp,
|
|
gpointer data)
|
|
{
|
|
ColorEnhanceParam_t *param = (ColorEnhanceParam_t*) data;
|
|
|
|
if (!param->has_alpha || src[3])
|
|
{
|
|
gdouble v = get_v (src);
|
|
|
|
if (v > param->vhi) param->vhi = v;
|
|
if (v < param->vlo) param->vlo = v;
|
|
}
|
|
}
|
|
|
|
static void
|
|
color_enhance_func (const guchar *src,
|
|
guchar *dest,
|
|
gint bpp,
|
|
gpointer data)
|
|
{
|
|
ColorEnhanceParam_t *param = (ColorEnhanceParam_t*) data;
|
|
|
|
enhance_it (src, dest, param->vlo, param->vhi);
|
|
|
|
if (param->has_alpha)
|
|
dest[3] = src[3];
|
|
}
|
|
|
|
static void
|
|
Color_Enhance (GimpDrawable *drawable)
|
|
{
|
|
ColorEnhanceParam_t param;
|
|
|
|
param.has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
|
|
param.vhi = 0.0;
|
|
param.vlo = 1.0;
|
|
|
|
gimp_rgn_iterate1 (drawable, run_mode, find_vhi_vlo, ¶m);
|
|
gimp_rgn_iterate2 (drawable, run_mode, color_enhance_func, ¶m);
|
|
}
|
|
|