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/*=========================================================================
*
* 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
*
* https://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.
*
*=========================================================================*/
// Software Guide : BeginLatex
//
// RGB images are commonly used for representing data acquired from
// cryogenic sections, optical microscopy and endoscopy. This example
// illustrates how to read and write RGB color images to and from a file.
// This requires the following headers as shown.
//
// \index{itk::RGBPixel!Image}
// \index{RGB!writing Image}
// \index{RGB!reading Image}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
#include "itkRGBPixel.h"
#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
// Software Guide : EndCodeSnippet
int
main(int argc, char ** argv)
{
// Verify the number of parameters in the command line
if (argc < 3)
{
std::cerr << "Usage: " << std::endl;
std::cerr << argv[0] << " inputRGBImageFile outputRGBImageFile "
<< std::endl;
return EXIT_FAILURE;
}
// Software Guide : BeginLatex
//
// The \doxygen{RGBPixel} class is templated over the type used to
// represent each one of the red, green and blue components. A typical
// instantiation of the RGB image class might be as follows.
//
// \index{itk::RGBPixel!Instantiation}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
using PixelType = itk::RGBPixel<unsigned char>;
using ImageType = itk::Image<PixelType, 2>;
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// The image type is used as a template parameter to instantiate
// the reader and writer.
//
// \index{itk::ImageFileReader!RGB Image}
// \index{itk::ImageFileWriter!RGB Image}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
using ReaderType = itk::ImageFileReader<ImageType>;
using WriterType = itk::ImageFileWriter<ImageType>;
auto reader = ReaderType::New();
auto writer = WriterType::New();
// Software Guide : EndCodeSnippet
const char * inputFilename = argv[1];
const char * outputFilename = argv[2];
// Software Guide : BeginLatex
//
// The filenames of the input and output files must be provided to the
// reader and writer respectively.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
reader->SetFileName(inputFilename);
writer->SetFileName(outputFilename);
// Software Guide : EndCodeSnippet
ImageType::Pointer image = reader->GetOutput();
writer->SetInput(image);
// Software Guide : BeginLatex
//
// Finally, execution of the pipeline can be triggered by invoking the
// Update() method in the writer.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
writer->Update();
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// You may have noticed that apart from the declaration of the
// \code{PixelType} there is nothing in this code specific to RGB
// images. All the actions required to support color images are implemented
// internally in the \doxygen{ImageIO} objects.
//
// Software Guide : EndLatex
return EXIT_SUCCESS;
}
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