[Insight-users] Using ImageReadCastWrite Example

[Misha Nizker]

Hello, 

Thanks for the help, the .jpg conversions work now.  However, there is still
a problem when using the GE5ImageIO filter.  For some reason, the GE images
still get rendered into black and white.  They are also slightly shifted to
the side.  

I am currently using RGBPixel< unsigned char > which seems to be working
fine for .jpg.  I tried unsigned short to increase the bit depth (to
16-bit), but the fileReader complained that it wasn't configured to use that
variable.  

Any idea on why the image is refusing to be rendered as colour?  I have
hosted the input (as seen by MRIcro) at http://24.83.47.77/MRI/input.jpg and
the output (converted into .png and took a screenshot, same result when
converting to .jpg) at http://24.83.47.77/MRI/output.jpg.  


Thank you,

Misha

-----Original Message-----
From: Luis Ibanez [mailto:luis.ibanez at kitware.com] 
Sent: Monday, June 28, 2004 8:35 PM
To: EUGINE NIZKER
Cc: insight-users at itk.org
Subject: Re: [Insight-users] Using ImageReadCastWrite Example


Hi Eugine,

If you want the image to be read and written in color
you must use a RGBPixel<> type as the image pixel type.

Please look at the examples:

    Insight/Examples/IO/
               RGBImageReadWrite.cxx
               RGBImageSeriesReadWrite.cxx


Regards,


    Luis


-----------------------
EUGINE NIZKER wrote:

> Hello,
> 
> I have recently downloaded and installed ITK version 1.6 and am trying to
use it for doing a GE5 -> PNG conversion.  I gather that the
ImageReadCastWrite code contains the proper info for that, and can actually
get the image to show, but the problem is that it's in greyscale (almost
black and white) instead of being in full color like the original image
(seen by MRIcro).  
> 
> I tested this with other conversions like .bmp to .jpg or even .jpg to
.jpg and the output always appears black and white for whatever reason...  I
am currently using the RescaleIntensityImageFilter between the input and
output since this is the one that was used in the example.  Could this be
the problem?  I tried changing the maximum and minimum intensity settings on
the filter, but that didn't seem to affect the output image at all.  
> 
> Can anyone please help?  
> 
> 
> 
> Here is my code just in case it's helpful:
> 
>
/*=========================================================================
> 
>   Program:   Insight Segmentation & Registration Toolkit
>   Module:    $RCSfile: ImageReadCastWrite.cxx,v $
>   Language:  C++
>   Date:      $Date: 2003/12/17 12:55:28 $
>   Version:   $Revision: 1.7 $
> 
>   Copyright (c) Insight Software Consortium. All rights reserved.
>   See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for
details.
> 
>      This software is distributed WITHOUT ANY WARRANTY; without even 
>      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
>      PURPOSE.  See the above copyright notices for more information.
> 
>
=========================================================================*/
> 
> #include "itkImageFileReader.h"
> #include "itkImageFileWriter.h"
> #include "itkRescaleIntensityImageFilter.h"
> 
> #include "itkCropImageFilter.h"
> 
> 
> #include "itkImage.h"
> 
> 
> int main( int argc, char ** argv )
> {
>   if( argc < 3 )
>     {
>     std::cerr << "Usage: " << std::endl;
>     std::cerr << argv[0] << " inputImageFile  outputImageFile " <<
std::endl;
>     return -1;
>     }
> 
> 
>   typedef unsigned char       InputPixelType;
>   typedef unsigned char       OutputPixelType;
>   const   unsigned int        Dimension = 2;
> 
>   typedef itk::Image< InputPixelType,  Dimension >    InputImageType;
>   typedef itk::Image< OutputPixelType, Dimension >    OutputImageType;
> 
>   typedef itk::ImageFileReader< InputImageType  >  ReaderType;
>   typedef itk::ImageFileWriter< OutputImageType >  WriterType;
> 
> 
>   typedef itk::RescaleIntensityImageFilter< 
>                                   InputImageType, 
>                                   OutputImageType >    FilterType;
>  
>   FilterType::Pointer filter = FilterType::New();
>   filter->SetOutputMinimum(   0 );
>   filter->SetOutputMaximum( 255 );
> 
>   ReaderType::Pointer reader = ReaderType::New();
>   WriterType::Pointer writer = WriterType::New();
> 
>   filter->SetInput( reader->GetOutput() );
>   writer->SetInput( filter->GetOutput() );
> 
> 
>   const char * inputFilename  = argv[1];
>   const char * outputFilename = argv[2];
> 
>   reader->SetFileName( inputFilename  );
>   writer->SetFileName( outputFilename );
> 
> 
>   try 
>     { 
>     writer->Update(); 
>     } 
>   catch( itk::ExceptionObject & err ) 
>     { 
>     std::cout << "ExceptionObject caught !" << std::endl; 
>     std::cout << err << std::endl; 
>     return -1;
>     } 
> 
> 
>   return 0;
> }
> 
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