[Insight-users] problem with RGB .bmp images

[Bill Lorensen]

John,

I tried your code and image. I can reproduce your problem. The
BMPImageIO is not properly generating a lookup table when the number
of colors == 0. It should generate a lookup table based on the depth
of the image.

Please enter a bug for this, following the proecedure at:
http://www.itk.org/Wiki/ITK_Procedure_for_Contributing_Bug_Fixes

Feel free to assign the bug to me.

Bill

On Wed, Oct 1, 2008 at 6:15 AM, John <dbgtjp at hotmail.com> wrote:
> Luis Ibanez <luis.ibanez at ...> writes:
>
>>
>>
>> Hi John,
>>
>> Are you declaring your image as an image whose
>> pixel type is itkRGBPixel<>  ?
>>
>> Please provide a minimal code snippet illustrating your problem.
>>
>>     Thanks
>>
>>        Luis
>
> Hi Luis,
>
> Of course I declared the pixel type as itk::RGBPixel.
>
> To verify that it is not an error of my code I took the example from
> Examples/DataRepresentation/Image/RGBImage.cxx.
>
> The following code results for the image http://jperl.gu6.info/000.bmp
> in the output:
>
> Pixel values from GetRed,GetGreen,GetBlue:
> Red = 137
> Green = 137
> Blue = 137
> Pixel values:
> Red = 137
> Green = 137
> Blue = 137
>
> Here the code I used:
>
> #include "itkImage.h"
> #include "itkImageFileReader.h"
>
> #include "itkRGBPixel.h"
>
> int main( int , char * argv[] )
> {
>  typedef itk::RGBPixel< unsigned char >    PixelType;
>  typedef itk::Image< PixelType, 2 >   ImageType;
>  typedef itk::ImageFileReader< ImageType >  ReaderType;
>
>  ReaderType::Pointer reader = ReaderType::New();
>  reader->SetFileName( argv[1] );
>  reader->Update();
>
>  ImageType::Pointer image = reader->GetOutput();
>
>  ImageType::IndexType pixelIndex;
>
>  pixelIndex[0] = 90;
>  pixelIndex[1] = 435;
>
>  PixelType onePixel = image->GetPixel( pixelIndex );
>
>  PixelType::ValueType red   = onePixel.GetRed();
>  PixelType::ValueType green = onePixel.GetGreen();
>  PixelType::ValueType blue  = onePixel.GetBlue();
>
>  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;
>
>  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;
>
>  return 0;
> }
>
> I tried the above code on linux and windows with the same result.
> Hope this helps you.
>
> John
>
>
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