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palette.cxx

Create series of slices through different color spaces. Usage: example_palette luv, generates luv_*.gif (44 images)

/************************************************************************/
/* */
/* Copyright 1998-2002 by Ullrich Koethe */
/* */
/* This file is part of the VIGRA computer vision library. */
/* The VIGRA Website is */
/* http://hci.iwr.uni-heidelberg.de/vigra/ */
/* Please direct questions, bug reports, and contributions to */
/* ullrich.koethe@iwr.uni-heidelberg.de or */
/* vigra@informatik.uni-hamburg.de */
/* */
/* Permission is hereby granted, free of charge, to any person */
/* obtaining a copy of this software and associated documentation */
/* files (the "Software"), to deal in the Software without */
/* restriction, including without limitation the rights to use, */
/* copy, modify, merge, publish, distribute, sublicense, and/or */
/* sell copies of the Software, and to permit persons to whom the */
/* Software is furnished to do so, subject to the following */
/* conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the */
/* Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES */
/* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND */
/* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT */
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/************************************************************************/
#include <stdio.h>
#include <iostream>
#include <algorithm>
#include <vigra/multi_array.hxx>
#include <vigra/stdimagefunctions.hxx>
#include <vigra/impex.hxx>
#include <vigra/colorconversions.hxx>
using namespace vigra;
template<class Polar2Cartesian, class Cartesian2RGB, class RGB2RGBPrime>
void createColorVsSaturation(MultiArray<2, RGBValue<UInt8> > & result, double brightness,
Polar2Cartesian polar2Cartesian, Cartesian2RGB cartesian2RGB, RGB2RGBPrime rgb2RGBPrime)
{
int w = result.width();
int h = result.height();
for(int y=0; y<h; ++y)
{
for(int x=0; x<w; ++x)
{
double saturation = (float)x / (w-1);
double color = (float)y / (h-1) * 360.0;
RGBValue<float> rgb = cartesian2RGB(
polar2Cartesian(color, brightness, saturation));
if(saturation > 1.0 ||
rgb.red() < 0.0 || rgb.red() > 255.0 ||
rgb.green() < 0.0 || rgb.green() > 255.0 ||
rgb.blue() < 0.0 || rgb.blue() > 255.0)
{
result(x,y) = RGBValue<unsigned char>(170.0);
}
else
{
result(x,y) = rgb2RGBPrime(rgb);
}
}
}
}
template<class Polar2Cartesian, class Cartesian2RGB, class RGB2RGBPrime>
void createColorVsBrightness(MultiArray<2, RGBValue<UInt8> > & result, double saturation,
Polar2Cartesian polar2Cartesian, Cartesian2RGB cartesian2RGB, RGB2RGBPrime rgb2RGBPrime)
{
int w = result.width();
int h = result.height();
for(int y=0; y<h; ++y)
{
for(int x=0; x<w; ++x)
{
double brightness = (float)x / (w-1);
double color = (float)y / (h-1) * 360.0;
RGBValue<float> rgb = cartesian2RGB(
polar2Cartesian(color, brightness, saturation));
if(saturation > 1.0 ||
rgb.red() < 0.0 || rgb.red() > 255.0 ||
rgb.green() < 0.0 || rgb.green() > 255.0 ||
rgb.blue() < 0.0 || rgb.blue() > 255.0)
{
result(x,y) = RGBValue<unsigned char>(170.0);
}
else
{
result(x,y) = rgb2RGBPrime(rgb);
}
}
}
}
template<class Polar2Cartesian, class Cartesian2RGB, class RGB2RGBPrime>
void createSaturationVsBrightness(MultiArray<2, RGBValue<UInt8> > & result, double color,
Polar2Cartesian polar2Cartesian, Cartesian2RGB cartesian2RGB, RGB2RGBPrime rgb2RGBPrime)
{
int w = result.width();
int h = result.height();
for(int y=0; y<h; ++y)
{
for(int x=0; x<w; ++x)
{
double brightness = (float)x / (w-1);
double saturation = (float)y / (h-1);
RGBValue<float> rgb = cartesian2RGB(
polar2Cartesian(color, brightness, saturation));
if(saturation > 1.0 ||
rgb.red() < 0.0 || rgb.red() > 255.0 ||
rgb.green() < 0.0 || rgb.green() > 255.0 ||
rgb.blue() < 0.0 || rgb.blue() > 255.0)
{
result(x,y) = RGBValue<unsigned char>(170.0);
}
else
{
result(x,y) = rgb2RGBPrime(rgb);
}
}
}
}
template<class Polar2Cartesian, class Cartesian2RGB, class RGB2RGBPrime>
void createColorCircle(MultiArray<2, RGBValue<UInt8> > & result, double brightness,
Polar2Cartesian polar2Cartesian, Cartesian2RGB cartesian2RGB, RGB2RGBPrime rgb2RGBPrime)
{
int w = result.width();
int h = result.height();
for(int y=0; y<h; ++y)
{
for(int x=0; x<w; ++x)
{
double dx = x/128.0 - 1.0;
double dy = -y/128.0 + 1.0;
double color = 180.0/M_PI*std::atan2(dy,dx);
double saturation = std::sqrt(dx*dx+dy*dy);
RGBValue<float> rgb = cartesian2RGB(
polar2Cartesian(color, brightness, saturation));
if(saturation > 1.0 ||
rgb.red() < 0.0 || rgb.red() > 255.0 ||
rgb.green() < 0.0 || rgb.green() > 255.0 ||
rgb.blue() < 0.0 || rgb.blue() > 255.0)
{
result(x,y) = RGBValue<unsigned char>(170.0);
}
else
{
result(x,y) = rgb2RGBPrime(rgb);
}
}
}
}
void write(char const * colorspace, char const * diagram, int i, MultiArray<2, RGBValue<UInt8> > const & img)
{
char buf[1000];
if(i < 10)
sprintf(buf, "%s_%s_0%d.gif", colorspace, diagram, i);
else
sprintf(buf, "%s_%s_%d.gif", colorspace, diagram, i);
exportImage(img, ImageExportInfo(buf));
std::cout << "Wrote " << buf << std::endl;
}
template<class Polar2Cartesian, class Cartesian2RGB, class RGB2RGBPrime>
void createColorSpaceSlices(char const * colorspace,
Polar2Cartesian polar2Cartesian, Cartesian2RGB cartesian2RGB, RGB2RGBPrime rgb2RGBPrime)
{
int w = 257;
int h = 257;
int Ymax = 10;
for(int i=0; i<=Ymax; ++i)
{
MultiArray<2, RGBValue<UInt8> > result(w, h);
createColorVsSaturation(result, (float)i/Ymax,
polar2Cartesian, cartesian2RGB, rgb2RGBPrime);
write(colorspace, "ColorVsSaturation", i, result);
createColorVsBrightness(result, (float)i/Ymax,
polar2Cartesian, cartesian2RGB, rgb2RGBPrime);
write(colorspace, "ColorVsBrightness", i, result);
createSaturationVsBrightness(result, (float)i/Ymax*360.0,
polar2Cartesian, cartesian2RGB, rgb2RGBPrime);
write(colorspace, "SaturationVsBrightness", i, result);
createColorCircle(result, (float)i/Ymax,
polar2Cartesian, cartesian2RGB, rgb2RGBPrime);
write(colorspace, "ColorCircle", i, result);
}
}
void usage(char const * prog)
{
std::cerr << "Usage: " << prog << " colorspace\n"
"with colorspace in [lab luv ypbpr ycbcr yiq yuv]\n\n";
std::cerr << "This programm calculates slices through the given color space\n"
"Images are named 'lab_SaturationVsBrightness_01.gif' etc.\n"
"where the first part of the name designates the colorspace used,\n"
"the second part says what is varied on the image\n"
"and the number codes the value of the quantity that is kept\n"
"constant in the image - 01 in the example means that the color\n"
"angle is 36 degrees = 1 * 360 degrees / 10\n";
}
int main(int argc, char ** argv)
{
if(argc <2)
{
usage(argv[0]);
return 1;
}
try
{
typedef TinyVector<float, 3> (*PolarFct)(double, double, double);
std::string colorspace(argv[1]);
if(colorspace == "lab")
{
createColorSpaceSlices("lab",
(PolarFct)&polar2Lab, Lab2RGBFunctor<float>(),
RGB2RGBPrimeFunctor<float, unsigned char>());
}
else if(colorspace == "luv")
{
createColorSpaceSlices("luv",
(PolarFct)&polar2Luv, Luv2RGBFunctor<float>(),
RGB2RGBPrimeFunctor<float, unsigned char>());
}
else if(colorspace == "ypbpr")
{
createColorSpaceSlices("ypbpr",
(PolarFct)&polar2YPrimePbPr, YPrimePbPr2RGBPrimeFunctor<float>(),
&NumericTraits<RGBValue<unsigned char> >::fromRealPromote);
}
else if(colorspace == "ycbcr")
{
createColorSpaceSlices("ycbcr",
(PolarFct)&polar2YPrimeCbCr, YPrimeCbCr2RGBPrimeFunctor<float>(),
&NumericTraits<RGBValue<unsigned char> >::fromRealPromote);
}
else if(colorspace == "yiq")
{
createColorSpaceSlices("yiq",
(PolarFct)&polar2YPrimeIQ, YPrimeIQ2RGBPrimeFunctor<float>(),
&NumericTraits<RGBValue<unsigned char> >::fromRealPromote);
}
else if(colorspace == "yuv")
{
createColorSpaceSlices("yuv",
(PolarFct)&polar2YPrimeUV, YPrimeUV2RGBPrimeFunctor<float>(),
&NumericTraits<RGBValue<unsigned char> >::fromRealPromote);
}
else
{
std::cerr << "Unknown colorspace: " << colorspace << std::endl;
usage(argv[0]);
return 1;
}
}
catch (std::exception & e)
{
std::cout << e.what() << std::endl;
return 1;
}
return 0;
}
vigra::ImageExportInfo
Argument object for the function exportImage().
Definition imageinfo.hxx:134
vigra::Lab2RGBFunctor
Convert perceptual uniform CIE L*a*b* into linear (raw) RGB.
Definition colorconversions.hxx:1732
vigra::Luv2RGBFunctor
Convert perceptual uniform CIE L*u*v* into linear (raw) RGB.
Definition colorconversions.hxx:1668
vigra::MultiArray
Main MultiArray class containing the memory management.
Definition multi_array.hxx:2483
vigra::RGB2RGBPrimeFunctor
Convert linear (raw) RGB into non-linear (gamma corrected) R'G'B'.
Definition colorconversions.hxx:278
vigra::RGBValue
Class for a single RGB value.
Definition rgbvalue.hxx:128
vigra::RGBValue::red
value_type & red()
Definition rgbvalue.hxx:278
vigra::RGBValue::blue
value_type & blue()
Definition rgbvalue.hxx:286
vigra::RGBValue::green
value_type & green()
Definition rgbvalue.hxx:282
vigra::TinyVector
Class for fixed size vectors.
Definition tinyvector.hxx:1008
vigra::YPrimeCbCr2RGBPrimeFunctor
Convert Y'CbCr color difference components into non-linear (gamma corrected) R'G'B'.
Definition colorconversions.hxx:2766
vigra::YPrimeIQ2RGBPrimeFunctor
Convert Y'IQ color components into non-linear (gamma corrected) R'G'B'.
Definition colorconversions.hxx:2410
vigra::YPrimePbPr2RGBPrimeFunctor
Convert Y'PbPr color difference components into non-linear (gamma corrected) R'G'B'.
Definition colorconversions.hxx:2227
vigra::YPrimeUV2RGBPrimeFunctor
Convert Y'UV color components into non-linear (gamma corrected) R'G'B'.
Definition colorconversions.hxx:2593
vigra::exportImage
void exportImage(...)
Write an image to a file.
impex.hxx
image import and export functions
vigra
vigra::polar2YPrimeCbCr
TinyVector< float, 3 > polar2YPrimeCbCr(double color, double brightness, double saturation)
Init Y'CbCr color triple from polar representation.
Definition colorconversions.hxx:3193
vigra::polar2YPrimeIQ
TinyVector< float, 3 > polar2YPrimeIQ(double color, double brightness, double saturation)
Init Y'IQ color triple from polar representation.
Definition colorconversions.hxx:3280
vigra::polar2YPrimeUV
TinyVector< float, 3 > polar2YPrimeUV(double color, double brightness, double saturation)
Init Y'UV color triple from polar representation.
Definition colorconversions.hxx:3365
vigra::polar2Lab
TinyVector< float, 3 > polar2Lab(double color, double brightness, double saturation)
Init L*a*b* color triple from polar representation.
Definition colorconversions.hxx:2937
vigra::polar2Luv
TinyVector< float, 3 > polar2Luv(double color, double brightness, double saturation)
Init L*u*v* color triple from polar representation.
Definition colorconversions.hxx:3023
vigra::polar2YPrimePbPr
TinyVector< float, 3 > polar2YPrimePbPr(double color, double brightness, double saturation)
Init Y'PbPr color triple from polar representation.
Definition colorconversions.hxx:3108

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany | html generated using doxygen and Python vigra 1.12.4