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| This example demonstrates how to assign transparency to pixels in an image. It then writes the result to a tif file for inspection and verification.
| | {{warning|1=The media wiki content on this page is no longer maintained. The examples presented on the https://itk.org/Wiki/* pages likely require ITK version 4.13 or earlier releases. In many cases, the examples on this page no longer conform to the best practices for modern ITK versions. |
| | | }} |
| (I don't think QuickView can handle this example - the transparency would be lost).
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| | |
| ==Transparency.cxx==
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| <source lang="cpp">
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| #include "itkImage.h"
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| #include "itkImageFileWriter.h"
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| #include "itkImageRegionIterator.h"
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| #include "itkTIFFImageIO.h"
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| #include "itkRGBAPixel.h"
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| | |
| int main(int argc, char *argv[])
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| { | |
| std::string outputFilename;
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| if(argc > 1)
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| {
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| outputFilename = argv[1];
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| }
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| else
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| {
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| outputFilename = "test.tif";
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| }
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| | |
| typedef itk::RGBAPixel<unsigned char> PixelType;
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| typedef itk::Image< PixelType, 2> ImageType;
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| | |
| ImageType::RegionType region;
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| ImageType::IndexType start;
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| start[0] = 0;
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| start[1] = 0;
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| | |
| ImageType::SizeType size;
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| size[0] = 200;
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| size[1] = 300;
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| region.SetSize(size);
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| region.SetIndex(start);
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| ImageType::Pointer image = ImageType::New();
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| image->SetRegions(region);
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| image->Allocate();
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| itk::ImageRegionIterator<ImageType> imageIterator(image,region);
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| while(!imageIterator.IsAtEnd())
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| {
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| ImageType::PixelType pixel = imageIterator.Get();
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|
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| if(imageIterator.GetIndex()[0] > 100)
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| {
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| pixel.SetRed(0);
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| pixel.SetGreen(255);
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| pixel.SetBlue(0);
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| //pixel.SetAlpha(255); // invisible
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| pixel.SetAlpha(122);
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| }
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| else
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| {
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| pixel.SetRed(255);
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| pixel.SetGreen(0);
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| pixel.SetBlue(0);
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| pixel.SetAlpha(0.5);
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| }
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| imageIterator.Set(pixel);
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|
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| ++imageIterator;
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| }
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| | |
| typedef itk::ImageFileWriter< ImageType > WriterType;
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| typedef itk::TIFFImageIO TIFFIOType;
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| WriterType::Pointer writer = WriterType::New();
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| TIFFIOType::Pointer tiffIO = TIFFIOType::New();
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| tiffIO->SetPixelType(itk::ImageIOBase::RGBA);
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| writer->SetFileName(outputFilename);
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| writer->SetInput(image);
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| writer->SetImageIO(tiffIO);
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| writer->Update();
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| | |
| return EXIT_SUCCESS;
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| }
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| </source>
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| | |
| {{ITKCMakeLists|{{SUBPAGENAME}}}}
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