[ITK] Getting ImageType for TIFF

[Matt McCormick]

Hi Marian,

Thanks for the update.  Offhand, I am not seeing the issue.

Could you please post a SSCCE [1], i.e. CMakeLists.txt, the code, and
the input data?

Thanks,
Matt

[1] http://sscce.org/

On Wed, Aug 13, 2014 at 2:27 PM, Мар'ян Климов <nekto1989 at gmail.com> wrote:
> {
>     typedef unsigned short PixelType;
>     typedef itk::Image<PixelType, 2> ImageType;
>     auto reader = itk::ImageFileReader<
> ImageType>::New();
>     reader->SetFileName("D:/TestData/input/input.tif");
>     reader->SetImageIO(itk::TIFFImageIO::New());
>
>     typedef unsigned short OutputPixelType;
>     typedef itk::Image<OutputPixelType, 2> OutputImageType;
>
>     auto writer = itk::ImageFileWriter<OutputImageType>::New();
>     writer->SetFileName("D:/TestData/output/ushort_to_ushort.tif");
>     auto image_io = itk::TIFFImageIO::New();
>     image_io->SetPixelType(itk::ImageIOBase::SCALAR);
>     writer->SetImageIO(image_io);
>     writer->SetInput(reader->GetOutput());
>     writer->Update(); //produces completely black
>     }
>
>     {
>     typedef itk::RGBAPixel<char> PixelType;
>     typedef itk::Image<PixelType, 2> ImageType;
>     auto reader = itk::ImageFileReader<ImageType>::New();
>     reader->SetFileName("D:/TestData/input/input.tif");
>     reader->SetImageIO(itk::TIFFImageIO::New());
>     reader->Update();
>
>     typedef unsigned short OutputPixelType;
>     typedef itk::Image<OutputPixelType, 2> OutputImageType;
>
>     auto input_image = reader->GetOutput();
>     auto output_image = OutputImageType::New();
>     output_image->CopyInformation(input_image);
>     output_image->SetRegions(input_image->GetLargestPossibleRegion());
>     output_image->Allocate();
>     itk::ImageRegionConstIterator<ImageType> const_iterator(input_image,
> input_image->GetLargestPossibleRegion());
>     itk::ImageRegionIterator<OutputImageType>
> rescaled_iterator(output_image, output_image->GetLargestPossibleRegion());
>     for (const_iterator.GoToBegin(), rescaled_iterator.GoToBegin();
> !const_iterator.IsAtEnd(); ++const_iterator, ++rescaled_iterator)
>       {
>       const PixelType& pixel = const_iterator.Get();
>       rescaled_iterator.Set(((pixel.GetAlpha() * 16 + pixel.GetRed()) * 16 +
> pixel.GetGreen()) * 16 + pixel.GetBlue());
>       }
>
>     auto writer = itk::ImageFileWriter<OutputImageType>::New();
>     writer->SetFileName("D:/TestData/output/rgba_char_to_ushort.tif");
>     auto image_io = itk::TIFFImageIO::New();
>     image_io->SetPixelType(itk::ImageIOBase::SCALAR);
>     writer->SetImageIO(image_io);
>     writer->SetInput(output_image);
>     writer->Update(); //output looks the same
>     }
>
>
> 2014-08-13 20:50 GMT+03:00 Matt McCormick <matt.mccormick at kitware.com>:
>>
>> Hi Marian,
>>
>>
>> If
>>
>>   itk::Image< unsigned  short, 2 >
>>
>> is used for the ImageType, does it work (note the dimension
>> specification).
>>
>> HTH,
>> Matt
>>
>> On Wed, Aug 13, 2014 at 1:47 PM, Мар'ян Климов <nekto1989 at gmail.com>
>> wrote:
>> > Hi,
>> >
>> > How to properly read 32-bit TIFF? I need to get itk::Image<unsigned
>> > short>
>> > on output. If I use it as ImageType for ImageFileReader, it is read as
>> > fully
>> > black (checked contrast with Image Watch and it is for sure completely
>> > empty). If I read it with pixel type RGBPixel<unsigned char> or
>> > RGBAPixel<unsigned char>, it is read properly. But I need to convert it
>> > manually to unsigned short after this. So what is the proper way of
>> > reading
>> > it? Do I need to create templated methods for every pixeltype with
>> > conversions to unsigned short?
>> >
>> > Best regards,
>> > Marian
>> >
>> > _______________________________________________
>> > Community mailing list
>> > Community at itk.org
>> > http://public.kitware.com/mailman/listinfo/community
>> >
>
>