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Bob Dougherty <bobd@stanford.edu> and Alex Wade <wade@ski.org> added the

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2003-01-23  Michael Natterer  <mitch@gimp.org>

	* modules/cdisplay_colorblind.c: Bob Dougherty <bobd@stanford.edu>
	and Alex Wade <wade@ski.org> added the code needed to make this
	filter actually do something useful. Thanks for this contribution.
	Addresses bug #101256.
This commit is contained in:
Michael Natterer
2003-01-23 13:27:38 +00:00
committed by Michael Natterer
parent 13b589252c
commit 3f07a7a11b
2 changed files with 194 additions and 42 deletions
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7
ChangeLog
View File

@ -1,3 +1,10 @@
2003-01-23 Michael Natterer <mitch@gimp.org>
* modules/cdisplay_colorblind.c: Bob Dougherty <bobd@stanford.edu>
and Alex Wade <wade@ski.org> added the code needed to make this
filter actually do something useful. Thanks for this contribution.
Addresses bug #101256.
2003-01-23 Sven Neumann <sven@gimp.org>
* app/config/gimpcoreconfig.c

227
modules/cdisplay_colorblind.c
View File

@ -2,7 +2,13 @@
* Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
*
* cdisplay_colorblind.c
* Copyright (C) 2002 Michael Natterer <mitch@gimp.org>
* Copyright (C) 2002-2003 Michael Natterer <mitch@gimp.org>,
* Robert Dougherty <bob@vischeck.com> and
* Alex Wade <alex@vischeck.com>
*
* This code is an implementation of an algorithm described by Hans Brettel,
* Francoise Vienot and John Mollon in the Journal of the Optical Society of
* America V14(10), pg 2647. (See http://vischeck.com/ for more info.)
*
* 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
@ -29,6 +35,7 @@
#include "libgimpbase/gimpbase.h"
#include "libgimpmodule/gimpmodule.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "libgimpmath/gimpmath.h"
#include "libgimp/libgimp-intl.h"
@ -36,7 +43,7 @@
typedef enum
{
COLORBLIND_DEFICIENCY_NONE,
COLORBLIND_DEFICIENCY_PROTONOPIA,
COLORBLIND_DEFICIENCY_PROTANOPIA,
COLORBLIND_DEFICIENCY_DEUTERANOPIA,
COLORBLIND_DEFICIENCY_TRITANOPIA,
COLORBLIND_DEFICIENCY_LAST = COLORBLIND_DEFICIENCY_TRITANOPIA
@ -98,11 +105,11 @@ static void colorblind_deficiency_callback (GtkWidget *widget
static const GimpModuleInfo cdisplay_colorblind_info =
{
GIMP_MODULE_ABI_VERSION,
N_("Colorblind display filter"),
"Michael Natterer <mitch@gimp.org>",
"v0.1",
"(c) 2002, released under the GPL",
"December 16, 2002"
N_("Color deficit simulation filter (Brettel-Vienot-Mollon algorithm)"),
"Michael Natterer <mitch@gimp.org>, Bob Dougherty <bob@vischeck.com>, Alex Wade <alex@vischeck.com>",
"v0.2",
"(c) 2002-2003, released under the GPL",
"January 22, 2003"
};
static GType cdisplay_colorblind_type = 0;
@ -131,14 +138,14 @@ cdisplay_colorblind_get_type (GTypeModule *module)
static const GTypeInfo display_info =
{
sizeof (CdisplayColorblindClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) cdisplay_colorblind_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (CdisplayColorblind),
0, /* n_preallocs */
(GInstanceInitFunc) cdisplay_colorblind_init,
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) cdisplay_colorblind_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (CdisplayColorblind),
0, /* n_preallocs */
(GInstanceInitFunc) cdisplay_colorblind_init,
};
cdisplay_colorblind_type =
@ -218,52 +225,190 @@ cdisplay_colorblind_convert (GimpColorDisplay *display,
gint bpl)
{
CdisplayColorblind *colorblind;
gint i, j;
gint i;
guchar *b;
gfloat rgb2lms[9],lms2rgb[9],gammaRGB[3],anchor_e[3],anchor[12];
gfloat a1, b1, c1, a2, b2, c2, inflectionVal, tmp;
gfloat red, green, blue, redOld, greenOld; /* Hold rgb values extracted from the buffer */
gint npix; /* Number of pixels in the image */
colorblind = CDISPLAY_COLORBLIND (display);
/* Require 3 bytes per pixel (assume RGB) */
if (bpp != 3)
return;
j = height;
/* For most modern Cathode-Ray Tube monitors (CRTs), the following
* are good estimates of the RGB->LMS and LMS->RGB transform
* matrices. They are based on spectra measured on a typical CRT
* with a PhotoResearch PR650 spectral photometer and the Stockman
* human cone fundamentals. NOTE: these estimates will NOT work well
* for LCDs!
*/
rgb2lms[0] = 0.05059983; rgb2lms[1] = 0.08585369; rgb2lms[2] = 0.00952420;
rgb2lms[3] = 0.01893033; rgb2lms[4] = 0.08925308; rgb2lms[5] = 0.01370054;
rgb2lms[6] = 0.00292202; rgb2lms[7] = 0.00975732; rgb2lms[8] = 0.07145979;
while (j--)
lms2rgb[0] = 30.830854; lms2rgb[1] = -29.832659; lms2rgb[2] = 1.610474;
lms2rgb[3] = -6.481468; lms2rgb[4] = 17.715578; lms2rgb[5] = -2.532642;
lms2rgb[6] = -0.375690; lms2rgb[7] = -1.199062; lms2rgb[8] = 14.273846;
/* The RGB<->LMS transforms above are computed from the human cone
* photo-pigment absorption spectra and the monitor phosphor
* emission spectra. These parameters are fairly constant for most
* humans and most montiors (at least for modern CRTs). However,
* gamma will vary quite a bit, as it is a property of the monitor
* (eg. amplifier gain), the video card, and even the
* software. Further, users can adjust their gammas (either via
* adjusting the monitor amp gains or in software). That said, the
* following are the gamma estimates that we have used in the
* Vischeck code. Many colorblind users have viewed our simulations
* and told us that they "work" (simulated and original images are
* indistinguishabled).
*/
gammaRGB[0] = 2.1;
gammaRGB[1] = 2.0;
gammaRGB[2] = 2.1;
/* Performs protan, deutan or tritan color image simulation based on
* Brettel, Vienot and Mollon JOSA 14/10 1997
* L,M,S for lambda=475,485,575,660
*
* Load the LMS anchor-point values for lambda = 475 & 485 nm (for
* protans & deutans) and the LMS values for lambda = 575 & 660 nm
* (for tritans)
*/
anchor[0] = 0.08008; anchor[1] = 0.1579; anchor[2] = 0.5897;
anchor[3] = 0.1284; anchor[4] = 0.2237; anchor[5] = 0.3636;
anchor[6] = 0.9856; anchor[7] = 0.7325; anchor[8] = 0.001079;
anchor[9] = 0.0914; anchor[10] = 0.007009; anchor[11] = 0.0;
/* We also need LMS for RGB=(1,1,1)- the equal-energy point (one of
* our anchors) (we can just peel this out of the rgb2lms transform
* matrix)
*/
anchor_e[0] = rgb2lms[0] + rgb2lms[1] + rgb2lms[2];
anchor_e[1] = rgb2lms[3] + rgb2lms[4] + rgb2lms[5];
anchor_e[2] = rgb2lms[6] + rgb2lms[7] + rgb2lms[8];
switch (colorblind->deficiency)
{
i = width;
b = buf;
default:
case COLORBLIND_DEFICIENCY_DEUTERANOPIA:
/* find a,b,c for lam=575nm and lam=475 */
a1 = anchor_e[1] * anchor[8] - anchor_e[2] * anchor[7];
b1 = anchor_e[2] * anchor[6] - anchor_e[0] * anchor[8];
c1 = anchor_e[0] * anchor[7] - anchor_e[1] * anchor[6];
a2 = anchor_e[1] * anchor[2] - anchor_e[2] * anchor[1];
b2 = anchor_e[2] * anchor[0] - anchor_e[0] * anchor[2];
c2 = anchor_e[0] * anchor[1] - anchor_e[1] * anchor[0];
inflectionVal = (anchor_e[2] / anchor_e[0]);
break;
case COLORBLIND_DEFICIENCY_PROTANOPIA:
/* find a,b,c for lam=575nm and lam=475 */
a1 = anchor_e[1] * anchor[8] - anchor_e[2] * anchor[7];
b1 = anchor_e[2] * anchor[6] - anchor_e[0] * anchor[8];
c1 = anchor_e[0] * anchor[7] - anchor_e[1] * anchor[6];
a2 = anchor_e[1] * anchor[2] - anchor_e[2] * anchor[1];
b2 = anchor_e[2] * anchor[0] - anchor_e[0] * anchor[2];
c2 = anchor_e[0] * anchor[1] - anchor_e[1] * anchor[0];
inflectionVal = (anchor_e[2] / anchor_e[1]);
break;
case COLORBLIND_DEFICIENCY_TRITANOPIA:
/* Set 1: regions where lambda_a=575, set 2: lambda_a=475 */
a1 = anchor_e[1] * anchor[11] - anchor_e[2] * anchor[10];
b1 = anchor_e[2] * anchor[9] - anchor_e[0] * anchor[11];
c1 = anchor_e[0] * anchor[10] - anchor_e[1] * anchor[9];
a2 = anchor_e[1] * anchor[5] - anchor_e[2] * anchor[4];
b2 = anchor_e[2] * anchor[3] - anchor_e[0] * anchor[5];
c2 = anchor_e[0] * anchor[4] - anchor_e[1] * anchor[3];
inflectionVal = (anchor_e[1] / anchor_e[0]);
break;
}
npix = height * width;
b = buf; /* pointer to the RGB color buffer */
for (i = npix - 1; i >= 0; i--)
{
red = b[0];
green = b[1];
blue = b[2];
/* Remove gamma to linearize RGB intensities */
red = pow (red, 1.0 / gammaRGB[0]);
green = pow (green, 1.0 / gammaRGB[1]);
blue = pow (blue, 1.0 / gammaRGB[2]);
/* Convert to LMS (dot product with transform matrix) */
redOld = red;
greenOld = green;
red = redOld * rgb2lms[0] + greenOld * rgb2lms[1] + blue * rgb2lms[2];
green = redOld * rgb2lms[3] + greenOld * rgb2lms[4] + blue * rgb2lms[5];
blue = redOld * rgb2lms[6] + greenOld * rgb2lms[7] + blue * rgb2lms[8];
switch (colorblind->deficiency)
{
case COLORBLIND_DEFICIENCY_PROTONOPIA:
case COLORBLIND_DEFICIENCY_DEUTERANOPIA:
/* FIXME: need proper formulas */
while (i--)
{
guchar red = b[0] >> 1;
guchar green = b[1] >> 1;
tmp = blue / red;
/* See which side of the inflection line we fall... */
if (tmp < inflectionVal)
green = -(a1 * red + c1 * blue) / b1;
else
green = -(a2 * red + c2 * blue) / b2;
break;
b[0] = b[1] = red + green;
b += bpp;
}
case COLORBLIND_DEFICIENCY_PROTANOPIA:
tmp = blue / green;
/* See which side of the inflection line we fall... */
if (tmp < inflectionVal)
red = -(b1 * green + c1 * blue) / a1;
else
red = -(b2 * green + c2 * blue) / a2;
break;
case COLORBLIND_DEFICIENCY_TRITANOPIA:
/* FIXME: need proper formula */
while (i--)
{
b[2] = 0;
b += bpp;
}
tmp = green / red;
/* See which side of the inflection line we fall... */
if (tmp < inflectionVal)
blue = -(a1 * red + b1 * green) / c1;
else
blue = -(a2 * red + b2 * green) / c2;
break;
default:
break;
}
buf += bpl;
/* Convert back to RGB (cross product with transform matrix) */
redOld = red;
greenOld = green;
red = redOld * lms2rgb[0] + greenOld * lms2rgb[1] + blue * lms2rgb[2];
green = redOld * lms2rgb[3] + greenOld * lms2rgb[4] + blue * lms2rgb[5];
blue = redOld * lms2rgb[6] + greenOld * lms2rgb[7] + blue * lms2rgb[8];
/* Apply gamma to go back to non-linear intensities */
red = pow (red, gammaRGB[0]);
green = pow (green, gammaRGB[1]);
blue = pow (blue, gammaRGB[2]);
/* Ensure that we stay within the RGB gamut */
/* *** FIX THIS: it would be better to desaturate than blindly clip. */
red = CLAMP (red, 0, 255);
green = CLAMP (green, 0, 255);
blue = CLAMP (blue, 0, 255);
/* Stuff result back into buffer */
b[0] = (guchar) red;
b[1] = (guchar) green;
b[2] = (guchar) blue;
/* Increment b by the number of bytes per pixel. */
b += bpp;
}
}
@ -306,7 +451,7 @@ cdisplay_colorblind_save_state (GimpColorDisplay *display)
g_snprintf (buf, sizeof (buf), "%d", colorblind->deficiency);
return gimp_parasite_new ("Display/Colorblind", GIMP_PARASITE_PERSISTENT,
strlen (buf) + 1, buf);
strlen (buf) + 1, buf);
}
static GtkWidget *
@ -334,8 +479,8 @@ cdisplay_colorblind_configure (GimpColorDisplay *display)
colorblind,
GINT_TO_POINTER (colorblind->deficiency),
_("Protonopia (insensitivity to red)"),
GINT_TO_POINTER (COLORBLIND_DEFICIENCY_PROTONOPIA),
_("Protanopia (insensitivity to red)"),
GINT_TO_POINTER (COLORBLIND_DEFICIENCY_PROTANOPIA),
NULL,
_("Deuteranopia (insensitivity to green)"),