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/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
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* cdisplay_colorblind.c
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* Copyright (C) 2002-2003 Michael Natterer <mitch@gimp.org>,
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* Sven Neumann <sven@gimp.org>,
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* Robert Dougherty <bob@vischeck.com> and
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* Alex Wade <alex@vischeck.com>
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* This code is an implementation of an algorithm described by Hans Brettel,
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* Francoise Vienot and John Mollon in the Journal of the Optical Society of
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* America V14(10), pg 2647. (See http://vischeck.com/ for more info.)
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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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#include "libgimpconfig/gimpconfig.h"
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#include "libgimpmath/gimpmath.h"
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#include "libgimpmodule/gimpmodule.h"
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#include "libgimpwidgets/gimpwidgets.h"
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#include "libgimp/libgimp-intl.h"
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COLORBLIND_DEFICIENCY_PROTANOPIA,
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COLORBLIND_DEFICIENCY_DEUTERANOPIA,
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COLORBLIND_DEFICIENCY_TRITANOPIA
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} ColorblindDeficiency;
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#define CDISPLAY_TYPE_COLORBLIND_DEFICIENCY (cdisplay_colorblind_deficiency_type)
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static GType cdisplay_colorblind_deficiency_get_type (GTypeModule *module);
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static const GEnumValue enum_values[] =
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{ COLORBLIND_DEFICIENCY_PROTANOPIA,
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"COLORBLIND_DEFICIENCY_PROTANOPIA", "protanopia" },
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{ COLORBLIND_DEFICIENCY_DEUTERANOPIA,
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"COLORBLIND_DEFICIENCY_DEUTERANOPIA", "deuteranopia" },
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{ COLORBLIND_DEFICIENCY_TRITANOPIA,
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"COLORBLIND_DEFICIENCY_TRITANOPIA", "tritanopia" },
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static const GimpEnumDesc enum_descs[] =
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{ COLORBLIND_DEFICIENCY_PROTANOPIA,
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N_("Protanopia (insensitivity to red)"), NULL },
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{ COLORBLIND_DEFICIENCY_DEUTERANOPIA,
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N_("Deuteranopia (insensitivity to green)"), NULL },
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{ COLORBLIND_DEFICIENCY_TRITANOPIA,
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N_("Tritanopia (insensitivity to blue)"), NULL },
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#define DEFAULT_DEFICIENCY COLORBLIND_DEFICIENCY_DEUTERANOPIA
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#define COLOR_CACHE_SIZE 1021
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#define CDISPLAY_TYPE_COLORBLIND (cdisplay_colorblind_type)
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#define CDISPLAY_COLORBLIND(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CDISPLAY_TYPE_COLORBLIND, CdisplayColorblind))
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#define CDISPLAY_COLORBLIND_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CDISPLAY_TYPE_COLORBLIND, CdisplayColorblindClass))
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#define CDISPLAY_IS_COLORBLIND(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CDISPLAY_TYPE_COLORBLIND))
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#define CDISPLAY_IS_COLORBLIND_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CDISPLAY_TYPE_COLORBLIND))
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typedef struct _CdisplayColorblind CdisplayColorblind;
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typedef struct _CdisplayColorblindClass CdisplayColorblindClass;
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struct _CdisplayColorblind
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GimpColorDisplay parent_instance;
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ColorblindDeficiency deficiency;
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guint32 cache[2 * COLOR_CACHE_SIZE];
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gfloat gamma_lut[256];
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struct _CdisplayColorblindClass
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GimpColorDisplayClass parent_instance;
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static GType cdisplay_colorblind_get_type (GTypeModule *module);
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static void cdisplay_colorblind_class_init (CdisplayColorblindClass *klass);
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static void cdisplay_colorblind_init (CdisplayColorblind *colorblind);
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static void cdisplay_colorblind_set_property (GObject *object,
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static void cdisplay_colorblind_get_property (GObject *object,
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static void cdisplay_colorblind_convert (GimpColorDisplay *display,
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static GtkWidget * cdisplay_colorblind_configure (GimpColorDisplay *display);
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static void cdisplay_colorblind_changed (GimpColorDisplay *display);
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static void cdisplay_colorblind_set_deficiency (CdisplayColorblind *colorblind,
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ColorblindDeficiency value);
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/* The RGB<->LMS transforms above are computed from the human cone
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* photo-pigment absorption spectra and the monitor phosphor
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* emission spectra. These parameters are fairly constant for most
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* humans and most montiors (at least for modern CRTs). However,
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* gamma will vary quite a bit, as it is a property of the monitor
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* (eg. amplifier gain), the video card, and even the
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* software. Further, users can adjust their gammas (either via
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* adjusting the monitor amp gains or in software). That said, the
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* following are the gamma estimates that we have used in the
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* Vischeck code. Many colorblind users have viewed our simulations
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* and told us that they "work" (simulated and original images are
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* indistinguishabled).
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static const gfloat gammaRGB = 2.1;
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/* For most modern Cathode-Ray Tube monitors (CRTs), the following
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* are good estimates of the RGB->LMS and LMS->RGB transform
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* matrices. They are based on spectra measured on a typical CRT
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* with a PhotoResearch PR650 spectral photometer and the Stockman
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* human cone fundamentals. NOTE: these estimates will NOT work well
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static const gfloat rgb2lms[9] =
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static const gfloat lms2rgb[9] =
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static const GimpModuleInfo cdisplay_colorblind_info =
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GIMP_MODULE_ABI_VERSION,
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N_("Color deficit simulation filter (Brettel-Vienot-Mollon algorithm)"),
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"Michael Natterer <mitch@gimp.org>, Bob Dougherty <bob@vischeck.com>, "
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"Alex Wade <alex@vischeck.com>",
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"(c) 2002-2004, released under the GPL",
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static GType cdisplay_colorblind_type = 0;
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static GType cdisplay_colorblind_deficiency_type = 0;
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static GimpColorDisplayClass *parent_class = NULL;
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G_MODULE_EXPORT const GimpModuleInfo *
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gimp_module_query (GTypeModule *module)
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return &cdisplay_colorblind_info;
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G_MODULE_EXPORT gboolean
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gimp_module_register (GTypeModule *module)
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cdisplay_colorblind_get_type (module);
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cdisplay_colorblind_deficiency_get_type (module);
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cdisplay_colorblind_get_type (GTypeModule *module)
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if (! cdisplay_colorblind_type)
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const GTypeInfo display_info =
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sizeof (CdisplayColorblindClass),
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(GBaseInitFunc) NULL,
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(GBaseFinalizeFunc) NULL,
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(GClassInitFunc) cdisplay_colorblind_class_init,
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NULL, /* class_finalize */
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NULL, /* class_data */
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sizeof (CdisplayColorblind),
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(GInstanceInitFunc) cdisplay_colorblind_init,
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cdisplay_colorblind_type =
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g_type_module_register_type (module,
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GIMP_TYPE_COLOR_DISPLAY,
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"CdisplayColorblind",
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return cdisplay_colorblind_type;
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cdisplay_colorblind_deficiency_get_type (GTypeModule *module)
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if (! cdisplay_colorblind_deficiency_type)
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cdisplay_colorblind_deficiency_type =
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g_type_module_register_enum (module, "CDisplayColorblindDeficiency",
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gimp_type_set_translation_domain (cdisplay_colorblind_deficiency_type,
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GETTEXT_PACKAGE "-libgimp");
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gimp_enum_set_value_descriptions (cdisplay_colorblind_deficiency_type,
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return cdisplay_colorblind_deficiency_type;
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cdisplay_colorblind_class_init (CdisplayColorblindClass *klass)
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GimpColorDisplayClass *display_class = GIMP_COLOR_DISPLAY_CLASS (klass);
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parent_class = g_type_class_peek_parent (klass);
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object_class->get_property = cdisplay_colorblind_get_property;
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object_class->set_property = cdisplay_colorblind_set_property;
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GIMP_CONFIG_INSTALL_PROP_ENUM (object_class, PROP_DEFICIENCY,
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CDISPLAY_TYPE_COLORBLIND_DEFICIENCY,
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display_class->name = _("Color Deficient Vision");
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display_class->help_id = "gimp-colordisplay-colorblind";
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display_class->stock_id = GIMP_STOCK_DISPLAY_FILTER_COLORBLIND;
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display_class->convert = cdisplay_colorblind_convert;
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display_class->configure = cdisplay_colorblind_configure;
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display_class->changed = cdisplay_colorblind_changed;
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cdisplay_colorblind_init (CdisplayColorblind *colorblind)
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for (i = 0; i < 256; i++)
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colorblind->gamma_lut[i] = pow (i, 1.0 / gammaRGB);
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cdisplay_colorblind_get_property (GObject *object,
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CdisplayColorblind *colorblind = CDISPLAY_COLORBLIND (object);
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case PROP_DEFICIENCY:
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g_value_set_enum (value, colorblind->deficiency);
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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cdisplay_colorblind_set_property (GObject *object,
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CdisplayColorblind *colorblind = CDISPLAY_COLORBLIND (object);
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case PROP_DEFICIENCY:
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cdisplay_colorblind_set_deficiency (colorblind,
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g_value_get_enum (value));
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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* This function performs a binary search in the gamma LUT. It
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* assumes a monotone gamma function and it simply clips out of gamut
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* values. It would be better to desaturate instead of clipping.
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lut_lookup (gfloat value,
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if (lut[offset] > value)
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if (lut[offset + 1] > value)
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/* the algorithm above can't reach 255 */
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if (offset == 254 && lut[255] < value)
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cdisplay_colorblind_convert (GimpColorDisplay *display,
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CdisplayColorblind *colorblind = CDISPLAY_COLORBLIND (display);
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const gfloat a1 = colorblind->a1;
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const gfloat b1 = colorblind->b1;
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const gfloat c1 = colorblind->c1;
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const gfloat a2 = colorblind->a2;
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const gfloat b2 = colorblind->b2;
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const gfloat c2 = colorblind->c2;
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gfloat red, green, blue;
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gfloat redOld, greenOld;
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/* Require 3 bytes per pixel (assume RGB) */
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for (y = 0; y < height; y++, buf += bpl)
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for (x = 0, b = buf; x < width; x++, b += bpp)
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/* First check our cache */
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pixel = b[0] << 16 | b[1] << 8 | b[2];
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index = pixel % COLOR_CACHE_SIZE;
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if (colorblind->cache[2 * index] == pixel)
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pixel = colorblind->cache[2 * index + 1];
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b[2] = pixel & 0xFF; pixel >>= 8;
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b[1] = pixel & 0xFF; pixel >>= 8;
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/* Remove gamma to linearize RGB intensities */
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red = colorblind->gamma_lut[b[0]];
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green = colorblind->gamma_lut[b[1]];
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blue = colorblind->gamma_lut[b[2]];
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/* Convert to LMS (dot product with transform matrix) */
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red = redOld * rgb2lms[0] + greenOld * rgb2lms[1] + blue * rgb2lms[2];
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green = redOld * rgb2lms[3] + greenOld * rgb2lms[4] + blue * rgb2lms[5];
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blue = redOld * rgb2lms[6] + greenOld * rgb2lms[7] + blue * rgb2lms[8];
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switch (colorblind->deficiency)
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case COLORBLIND_DEFICIENCY_DEUTERANOPIA:
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/* See which side of the inflection line we fall... */
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if (tmp < colorblind->inflection)
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green = -(a1 * red + c1 * blue) / b1;
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green = -(a2 * red + c2 * blue) / b2;
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case COLORBLIND_DEFICIENCY_PROTANOPIA:
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/* See which side of the inflection line we fall... */
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if (tmp < colorblind->inflection)
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red = -(b1 * green + c1 * blue) / a1;
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red = -(b2 * green + c2 * blue) / a2;
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case COLORBLIND_DEFICIENCY_TRITANOPIA:
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/* See which side of the inflection line we fall... */
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if (tmp < colorblind->inflection)
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blue = -(a1 * red + b1 * green) / c1;
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blue = -(a2 * red + b2 * green) / c2;
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/* Convert back to RGB (cross product with transform matrix) */
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red = redOld * lms2rgb[0] + greenOld * lms2rgb[1] + blue * lms2rgb[2];
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green = redOld * lms2rgb[3] + greenOld * lms2rgb[4] + blue * lms2rgb[5];
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blue = redOld * lms2rgb[6] + greenOld * lms2rgb[7] + blue * lms2rgb[8];
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/* Apply gamma to go back to non-linear intensities */
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b[0] = lut_lookup (red, colorblind->gamma_lut);
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b[1] = lut_lookup (green, colorblind->gamma_lut);
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b[2] = lut_lookup (blue, colorblind->gamma_lut);
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/* Put the result into our cache */
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colorblind->cache[2 * index] = pixel;
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colorblind->cache[2 * index + 1] = b[0] << 16 | b[1] << 8 | b[2];
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cdisplay_colorblind_configure (GimpColorDisplay *display)
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CdisplayColorblind *colorblind = CDISPLAY_COLORBLIND (display);
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hbox = gtk_hbox_new (FALSE, 6);
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label = gtk_label_new_with_mnemonic (_("Color _deficiency type:"));
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gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
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gtk_widget_show (label);
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gimp_prop_enum_combo_box_new (G_OBJECT (colorblind), "deficiency", 0, 0);
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gtk_box_pack_start (GTK_BOX (hbox), combo, TRUE, TRUE, 0);
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gtk_widget_show (combo);
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gtk_label_set_mnemonic_widget (GTK_LABEL (label), combo);
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cdisplay_colorblind_changed (GimpColorDisplay *display)
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CdisplayColorblind *colorblind = CDISPLAY_COLORBLIND (display);
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/* This function performs initialisations that are dependant
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* on the type of color deficiency.
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/* Performs protan, deutan or tritan color image simulation based on
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* Brettel, Vienot and Mollon JOSA 14/10 1997
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* L,M,S for lambda=475,485,575,660
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* Load the LMS anchor-point values for lambda = 475 & 485 nm (for
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* protans & deutans) and the LMS values for lambda = 575 & 660 nm
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anchor[0] = 0.08008; anchor[1] = 0.1579; anchor[2] = 0.5897;
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anchor[3] = 0.1284; anchor[4] = 0.2237; anchor[5] = 0.3636;
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anchor[6] = 0.9856; anchor[7] = 0.7325; anchor[8] = 0.001079;
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anchor[9] = 0.0914; anchor[10] = 0.007009; anchor[11] = 0.0;
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/* We also need LMS for RGB=(1,1,1)- the equal-energy point (one of
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* our anchors) (we can just peel this out of the rgb2lms transform
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anchor_e[0] = rgb2lms[0] + rgb2lms[1] + rgb2lms[2];
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anchor_e[1] = rgb2lms[3] + rgb2lms[4] + rgb2lms[5];
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anchor_e[2] = rgb2lms[6] + rgb2lms[7] + rgb2lms[8];
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switch (colorblind->deficiency)
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case COLORBLIND_DEFICIENCY_DEUTERANOPIA:
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/* find a,b,c for lam=575nm and lam=475 */
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colorblind->a1 = anchor_e[1] * anchor[8] - anchor_e[2] * anchor[7];
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colorblind->b1 = anchor_e[2] * anchor[6] - anchor_e[0] * anchor[8];
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colorblind->c1 = anchor_e[0] * anchor[7] - anchor_e[1] * anchor[6];
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colorblind->a2 = anchor_e[1] * anchor[2] - anchor_e[2] * anchor[1];
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colorblind->b2 = anchor_e[2] * anchor[0] - anchor_e[0] * anchor[2];
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colorblind->c2 = anchor_e[0] * anchor[1] - anchor_e[1] * anchor[0];
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colorblind->inflection = (anchor_e[2] / anchor_e[0]);
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case COLORBLIND_DEFICIENCY_PROTANOPIA:
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/* find a,b,c for lam=575nm and lam=475 */
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colorblind->a1 = anchor_e[1] * anchor[8] - anchor_e[2] * anchor[7];
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colorblind->b1 = anchor_e[2] * anchor[6] - anchor_e[0] * anchor[8];
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colorblind->c1 = anchor_e[0] * anchor[7] - anchor_e[1] * anchor[6];
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colorblind->a2 = anchor_e[1] * anchor[2] - anchor_e[2] * anchor[1];
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colorblind->b2 = anchor_e[2] * anchor[0] - anchor_e[0] * anchor[2];
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colorblind->c2 = anchor_e[0] * anchor[1] - anchor_e[1] * anchor[0];
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colorblind->inflection = (anchor_e[2] / anchor_e[1]);
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case COLORBLIND_DEFICIENCY_TRITANOPIA:
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/* Set 1: regions where lambda_a=575, set 2: lambda_a=475 */
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colorblind->a1 = anchor_e[1] * anchor[11] - anchor_e[2] * anchor[10];
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colorblind->b1 = anchor_e[2] * anchor[9] - anchor_e[0] * anchor[11];
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colorblind->c1 = anchor_e[0] * anchor[10] - anchor_e[1] * anchor[9];
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colorblind->a2 = anchor_e[1] * anchor[5] - anchor_e[2] * anchor[4];
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colorblind->b2 = anchor_e[2] * anchor[3] - anchor_e[0] * anchor[5];
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colorblind->c2 = anchor_e[0] * anchor[4] - anchor_e[1] * anchor[3];
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colorblind->inflection = (anchor_e[1] / anchor_e[0]);
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/* Invalidate the cache */
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memset (colorblind->cache, 0, sizeof (colorblind->cache));
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cdisplay_colorblind_set_deficiency (CdisplayColorblind *colorblind,
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ColorblindDeficiency value)
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if (value != colorblind->deficiency)
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GEnumClass *enum_class;
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enum_class = g_type_class_peek (CDISPLAY_TYPE_COLORBLIND_DEFICIENCY);
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if (! g_enum_get_value (enum_class, value))
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colorblind->deficiency = value;
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g_object_notify (G_OBJECT (colorblind), "deficiency");
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gimp_color_display_changed (GIMP_COLOR_DISPLAY (colorblind));
added
removed
modules/cdisplay_colorblind.c
