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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: RGBImage.cxx
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#if defined(_MSC_VER)
#pragma warning ( disable : 4786 )
#endif
#include "itkImage.h"
#include "itkImageFileReader.h"
// Software Guide : BeginLatex
//
// Thanks to the flexibility offered by the
// \href{http://www.boost.org/more/generic_programming.html}{Generic
// Programming} style on which ITK is based, it is possible to
// instantiate images of arbitrary pixel type. The following example
// illustrates how a color image with RGB pixels can be defined.
//
// A class intended to support the RGB pixel type is available in ITK. You
// could also define your own pixel class and use it to instantiate a
// custom image type. In order to use the \doxygen{RGBPixel} class, it is
// necessary to include its header file.
//
// \index{itk::RGBPixel}
// \index{itk::RGBPixel!Image}
// \index{itk::RGBPixel!header}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
#include "itkRGBPixel.h"
// Software Guide : EndCodeSnippet
int main( int , char * argv[] )
{
// Software Guide : BeginLatex
//
// The RGB pixel class is templated over a type used to represent each one
// of the red, green and blue pixel components. A typical instantiation of the
// templated class is as follows.
//
// \index{itk::RGBPixel!Instantiation}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
typedef itk::RGBPixel< unsigned char > PixelType;
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// The type is then used as the pixel template parameter of the image.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
typedef itk::Image< PixelType, 3 > ImageType;
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// The image type can be used to instantiate other filter, for example,
// an \doxygen{ImageFileReader} object that will read the image from a
// file.
//
// \index{itk::ImageFileReader!RGB Image}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
typedef itk::ImageFileReader< ImageType > ReaderType;
// Software Guide : EndCodeSnippet
ReaderType::Pointer reader = ReaderType::New();
const char * filename = argv[1];
reader->SetFileName( filename );
reader->Update();
ImageType::Pointer image = reader->GetOutput();
ImageType::IndexType pixelIndex;
pixelIndex[0] = 25;
pixelIndex[1] = 35;
pixelIndex[2] = 0;
// Software Guide : BeginLatex
//
// Access to the color components of the pixels can now be performed using
// the methods provided by the RGBPixel class.
//
// \index{itk::Image!GetPixel()}
// \index{itk::RGBPixel!GetRed()}
// \index{itk::RGBPixel!GetGreen()}
// \index{itk::RGBPixel!GetBlue()}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
PixelType onePixel = image->GetPixel( pixelIndex );
PixelType::ValueType red = onePixel.GetRed();
PixelType::ValueType green = onePixel.GetGreen();
PixelType::ValueType blue = onePixel.GetBlue();
// Software Guide : EndCodeSnippet
std::cout << "Pixel values from GetRed,GetGreen,GetBlue:" << std::endl;
std::cout << "Red = "
<< itk::NumericTraits<PixelType::ValueType>::PrintType(red)
<< std::endl;
std::cout << "Green = "
<< itk::NumericTraits<PixelType::ValueType>::PrintType(green)
<< std::endl;
std::cout << "Blue = "
<< itk::NumericTraits<PixelType::ValueType>::PrintType(blue)
<< std::endl;
// Software Guide : BeginLatex
//
// The subindex notation can also be used since the \doxygen{RGBPixel} inherits the
// \code{[]} operator from the \doxygen{FixedArray} class.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
red = onePixel[0]; // extract Red component
green = onePixel[1]; // extract Green component
blue = onePixel[2]; // extract Blue component
std::cout << "Pixel values:" << std::endl;
std::cout << "Red = "
<< itk::NumericTraits<PixelType::ValueType>::PrintType(red)
<< std::endl;
std::cout << "Green = "
<< itk::NumericTraits<PixelType::ValueType>::PrintType(green)
<< std::endl;
std::cout << "Blue = "
<< itk::NumericTraits<PixelType::ValueType>::PrintType(blue)
<< std::endl;
// Software Guide : EndCodeSnippet
// Lets repeat that both \code{SetPixel()} and \code{GetPixel()} are
// inefficient and should only be used for debugging purposes or for
// implementing interactions with a graphical user interface such as
// querying pixel value by clicking with the mouse.
//
return 0;
}
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