MantisBT - ITK
If the bitmap images are read, the single color values get lost and are translated into greyscale values.
The problem was already reproduced and investigated by Bill Lorensen.
"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."
The output will be:
Pixel values from GetRed,GetGreen,GetBlue:
Red = 36
Green = 36
Blue = 36
Pixel values:
Red = 36
Green = 36
Blue = 36
//file RGBTest.cxx
#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] = 3;
pixelIndex[1] = 3;
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;
}
//CMakeLists.txt
PROJECT(RGBTest)
# Find ITK.
FIND_PACKAGE(ITK REQUIRED)
IF(ITK_FOUND)
INCLUDE(${ITK_USE_FILE})
ENDIF(ITK_FOUND)
ADD_EXECUTABLE(RGBTest RGBTest.cxx )
TARGET_LINK_LIBRARIES(RGBTest ITKCommon ITKIO)
0001001_os_sn6040.bmp (590,902) 2008-10-02 13:50https://public.kitware.com/Bug/file/1745/0001001_os_sn6040.bmp