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| palette.cxx |
--- | --- | ---

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

    /************************************************************************/
    /*                                                                      */
    /*               Copyright 1998-2002 by Ullrich Koethe                  */
    /*       Cognitive Systems Group, University of Hamburg, Germany        */
    /*                                                                      */
    /*    This file is part of the VIGRA computer vision library.           */
    /*    ( Version 1.5.0, Dec 07 2006 )                                    */
    /*    The VIGRA Website is                                              */
    /*        http://kogs-www.informatik.uni-hamburg.de/~koethe/vigra/      */
    /*    Please direct questions, bug reports, and contributions to        */
    /*        koethe@informatik.uni-hamburg.de          or                  */
    /*        vigra@kogs1.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      */
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    /*    OTHER DEALINGS IN THE SOFTWARE.                                   */
    /*                                                                      */
    /************************************************************************/

    #include <iostream>
    #include <algorithm>
    #include "vigra/stdimage.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(BRGBImage & 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(BRGBImage & 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(BRGBImage & 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(BRGBImage & 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, BRGBImage 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(srcImageRange(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)
        {

            BRGBImage 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 (StdException & e)
        {
            std::cout << e.what() << std::endl;
            return 1;
        }

        return 0;
    }

© Ullrich Köthe (koethe@informatik.uni-hamburg.de) Cognitive Systems Group, University of Hamburg, Germany | html generated using doxygen and Python VIGRA 1.5.0 (7 Dec 2006)