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palette.cxx VIGRA

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 */
/* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, */
/* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING */
/* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR */
/* OTHER DEALINGS IN THE SOFTWARE. */
/* */
/************************************************************************/
#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);
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)
{
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",
}
else if(colorspace == "luv")
{
createColorSpaceSlices("luv",
}
else if(colorspace == "ypbpr")
{
createColorSpaceSlices("ypbpr",
&NumericTraits<RGBValue<unsigned char> >::fromRealPromote);
}
else if(colorspace == "ycbcr")
{
createColorSpaceSlices("ycbcr",
&NumericTraits<RGBValue<unsigned char> >::fromRealPromote);
}
else if(colorspace == "yiq")
{
createColorSpaceSlices("yiq",
&NumericTraits<RGBValue<unsigned char> >::fromRealPromote);
}
else if(colorspace == "yuv")
{
createColorSpaceSlices("yuv",
&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::RGBValue::red
value_type & red()
Definition: rgbvalue.hxx:278
vigra::TinyVector< float, 3 >
vigra::YPrimePbPr2RGBPrimeFunctor
Convert Y'PbPr color difference components into non-linear (gamma corrected) R'G'B'.
Definition: colorconversions.hxx:2226
vigra::MultiArray
Main MultiArray class containing the memory management.
Definition: multi_array.hxx:2474
vigra
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::RGB2RGBPrimeFunctor
Convert linear (raw) RGB into non-linear (gamma corrected) R'G'B'.
Definition: colorconversions.hxx:277
vigra::Luv2RGBFunctor
Convert perceptual uniform CIE L*u*v* into linear (raw) RGB.
Definition: colorconversions.hxx:1667
vigra::RGBValue::blue
value_type & blue()
Definition: rgbvalue.hxx:286
vigra::YPrimeCbCr2RGBPrimeFunctor
Convert Y'CbCr color difference components into non-linear (gamma corrected) R'G'B'.
Definition: colorconversions.hxx:2765
vigra::RGBValue::green
value_type & green()
Definition: rgbvalue.hxx:282
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::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::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::RGBValue
Class for a single RGB value.
Definition: accessor.hxx:938
vigra::polar2YPrimePbPr
TinyVector< float, 3 > polar2YPrimePbPr(double color, double brightness, double saturation)
Init Y'PbPr color triple from polar representation.
Definition: colorconversions.hxx:3108
impex.hxx
image import and export functions
vigra::ImageExportInfo
Argument object for the function exportImage().
Definition: imageinfo.hxx:133
vigra::YPrimeIQ2RGBPrimeFunctor
Convert Y'IQ color components into non-linear (gamma corrected) R'G'B'.
Definition: colorconversions.hxx:2409
vigra::exportImage
void exportImage(...)
Write an image to a file.
vigra::Lab2RGBFunctor
Convert perceptual uniform CIE L*a*b* into linear (raw) RGB.
Definition: colorconversions.hxx:1731
vigra::YPrimeUV2RGBPrimeFunctor
Convert Y'UV color components into non-linear (gamma corrected) R'G'B'.
Definition: colorconversions.hxx:2592

© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de)
Heidelberg Collaboratory for Image Processing, University of Heidelberg, Germany

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