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/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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* Normalize 1.00 --- image filter plug-in
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* Copyright (C) 1997 Adam D. Moss (adam@foxbox.org)
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* Very largely based on Quartic's "Contrast Autostretch"
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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/* This plugin performs almost the same operation as the 'contrast
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* autostretch' plugin, except that it won't allow the colour channels
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* to normalize independently. This is actually what most people probably
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* want instead of contrast-autostretch; use c-a only if you wish to remove
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* an undesirable colour-tint from a source image which is supposed to
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* contain pure-white and pure-black.
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#include <libgimp/gimp.h>
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#include "libgimp/stdplugins-intl.h"
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#define PLUG_IN_PROC "plug-in-normalize"
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/* Declare local functions.
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static void query (void);
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static void run (const gchar *name,
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const GimpParam *param,
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GimpParam **return_vals);
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static void normalize (GimpDrawable *drawable);
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static void indexed_normalize (gint32 image_ID);
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const GimpPlugInInfo PLUG_IN_INFO =
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query, /* query_proc */
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static const GimpParamDef args[] =
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{ GIMP_PDB_INT32, "run-mode", "Interactive, non-interactive" },
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{ GIMP_PDB_IMAGE, "image", "Input image" },
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{ GIMP_PDB_DRAWABLE, "drawable", "Input drawable" }
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gimp_install_procedure (PLUG_IN_PROC,
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N_("Stretch brightness values to cover the full range"),
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"This plugin performs almost the same operation as "
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"the 'contrast autostretch' plugin, except that it "
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"won't allow the color channels to normalize "
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"independently. This is actually what most people "
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"probably want instead of contrast-autostretch; use "
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"c-a only if you wish to remove an undesirable "
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"color-tint from a source image which is supposed to "
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"contain pure-white and pure-black.",
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"Adam D. Moss, Federico Mena Quintero",
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"Adam D. Moss, Federico Mena Quintero",
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"RGB*, GRAY*, INDEXED*",
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G_N_ELEMENTS (args), 0,
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gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Colors/Auto");
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run (const gchar *name,
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const GimpParam *param,
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GimpParam **return_vals)
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static GimpParam values[1];
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GimpDrawable *drawable;
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GimpPDBStatusType status = GIMP_PDB_SUCCESS;
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GimpRunMode run_mode;
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run_mode = param[0].data.d_int32;
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/* Get the specified drawable */
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drawable = gimp_drawable_get (param[2].data.d_drawable);
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image_ID = param[1].data.d_image;
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/* Make sure that the drawable is gray or RGB color */
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if (gimp_drawable_is_rgb (drawable->drawable_id) ||
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gimp_drawable_is_gray (drawable->drawable_id))
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gimp_progress_init (_("Normalizing"));
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gimp_tile_cache_ntiles (2 * (drawable->width / gimp_tile_width () + 1));
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normalize (drawable);
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if (run_mode != GIMP_RUN_NONINTERACTIVE)
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gimp_displays_flush ();
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else if (gimp_drawable_is_indexed (drawable->drawable_id))
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indexed_normalize (image_ID);
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if (run_mode != GIMP_RUN_NONINTERACTIVE)
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gimp_displays_flush ();
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status = GIMP_PDB_EXECUTION_ERROR;
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*return_vals = values;
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values[0].type = GIMP_PDB_STATUS;
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values[0].data.d_status = status;
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gimp_drawable_detach (drawable);
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indexed_normalize (gint32 image_ID) /* a.d.m. */
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cmap = gimp_image_get_colormap (image_ID, &ncols);
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g_printerr ("normalize: cmap was NULL! Quitting...\n");
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for (i=0;i<ncols;i++)
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if (cmap[i*3 +0] > hi) hi=cmap[i*3 +0];
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if (cmap[i*3 +1] > hi) hi=cmap[i*3 +1];
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if (cmap[i*3 +2] > hi) hi=cmap[i*3 +2];
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if (cmap[i*3 +0] < lo) lo=cmap[i*3 +0];
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if (cmap[i*3 +1] < lo) lo=cmap[i*3 +1];
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if (cmap[i*3 +2] < lo) lo=cmap[i*3 +2];
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for (i=0;i<ncols;i++)
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cmap[i*3 +0] = (255 * (cmap[i*3 +0] - lo)) / (hi-lo);
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cmap[i*3 +1] = (255 * (cmap[i*3 +1] - lo)) / (hi-lo);
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cmap[i*3 +2] = (255 * (cmap[i*3 +2] - lo)) / (hi-lo);
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gimp_image_set_colormap (image_ID, cmap, ncols);
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find_min_max (const guchar *src,
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NormalizeParam_t *param = (NormalizeParam_t*) data;
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for (b = 0; b < param->alpha; b++)
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if (!param->has_alpha || src[param->alpha])
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if (src[b] < param->min)
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if (src[b] > param->max)
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normalize_func (const guchar *src,
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NormalizeParam_t *param = (NormalizeParam_t*) data;
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for (b = 0; b < param->alpha; b++)
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dest[b] = param->lut[src[b]];
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if (param->has_alpha)
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dest[param->alpha] = src[param->alpha];
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normalize (GimpDrawable *drawable)
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NormalizeParam_t param;
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param.has_alpha = gimp_drawable_has_alpha (drawable->drawable_id);
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param.alpha = (param.has_alpha) ? drawable->bpp - 1 : drawable->bpp;
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gimp_rgn_iterate1 (drawable, 0 /* unused */, find_min_max, ¶m);
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range = param.max - param.min;
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for (x = param.min; x <= param.max; x++)
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param.lut[x] = 255 * (x - param.min) / range;
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param.lut[(gint)param.min] = param.min;
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gimp_rgn_iterate2 (drawable, 0 /* unused */, normalize_func, ¶m);
added
removed
plug-ins/common/contrast-normalize.c
