ITK  5.2.0
Insight Toolkit
Examples/Filtering/RGBToGrayscale.cxx
/*=========================================================================
*
* Copyright NumFOCUS
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
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*=========================================================================*/
// Software Guide : BeginLatex
//
// This example illustrates how to convert an RGB image into a grayscale one.
// The \doxygen{RGBToLuminanceImageFilter} is the central piece of this
// example.
//
// \index{itk::RGBToLuminanceImageFilter!RGB Images}
//
// Software Guide : EndLatex
// Software Guide : BeginLatex
//
// The first step required to use this filter is to include its header file.
//
// \index{itk::RGBToLuminanceImageFilter!header}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
// Software Guide : EndCodeSnippet
#include "itkRGBPixel.h"
#include "itkImage.h"
int
main(int argc, char * argv[])
{
if (argc < 3)
{
std::cerr << "Usage: " << std::endl;
std::cerr << argv[0] << " inputRGBImageFile outputGrayscaleImageFile "
<< std::endl;
return EXIT_FAILURE;
}
constexpr unsigned int Dimension = 2;
using InputPixelType = itk::RGBPixel<unsigned char>;
using InputImageType = itk::Image<InputPixelType, Dimension>;
using OutputImageType = itk::Image<unsigned char, Dimension>;
ReaderType::Pointer reader = ReaderType::New();
reader->SetFileName(argv[1]);
using FilterType =
FilterType::Pointer filter = FilterType::New();
filter->SetInput(reader->GetOutput());
WriterType::Pointer writer = WriterType::New();
writer->SetInput(filter->GetOutput());
writer->SetFileName(argv[2]);
try
{
writer->Update();
}
catch (const itk::ExceptionObject & excp)
{
std::cerr << "Exception Thrown" << std::endl;
std::cerr << excp << std::endl;
}
return EXIT_SUCCESS;
}
itk::RGBPixel
Represent Red, Green and Blue components for color images.
Definition: itkRGBPixel.h:58
itkRGBPixel.h
itkRGBToLuminanceImageFilter.h
itkImageFileReader.h
itkImage.h
itk::ImageFileReader
Data source that reads image data from a single file.
Definition: itkImageFileReader.h:75
itk::ImageFileWriter
Writes image data to a single file.
Definition: itkImageFileWriter.h:87
itkImageFileWriter.h
itk::RGBToLuminanceImageFilter
Converts an RGB image into a grayscale image.
Definition: itkRGBToLuminanceImageFilter.h:69
itk::Image
Templated n-dimensional image class.
Definition: itkImage.h:86
itk::GTest::TypedefsAndConstructors::Dimension2::Dimension
constexpr unsigned int Dimension
Definition: itkGTestTypedefsAndConstructors.h:44