[vtkusers] Problem with using vtkJPEGWriter

[Bruno da Silva de Oliveira]

Hi,

Didn't actually read your code, but what happens if you use a 
vtkPNGWriter instead? Does the resulting image look correct?

Regards,

Ravi Samala wrote:

> Dear /VTKUser's/,
>
>  
>
> *Objective*: To write some data to a JPEG file.
>
> *Problem*:   The final image is black color !
>
>  
>
>  
>
> The code is as follows:
>
>  
>
> //****************************************************
>
> // *****         Used to read 16 bit Image       *****
>
> //****************************************************
>
> *vtkVolume16Reader *v16Img = vtkVolume16Reader::New();          *
>
>     v16Img->SetDataDimensions (sizex,sizey);
>
>     v16Img->SetImageRange   (atoi(argv[3]),atoi(argv[4]));//Specify 
> the number of slices to read
>
>     v16Img->SetHeaderSize(HeadS); // Specify the number of bytes to 
> seek over at start of image
>
>     v16Img->SetFilePrefix (argv[2]);      //Specify the File prefix of 
> all the slices (files)
>
>     v16Img->SetDataSpacing (0.1, 0.1, 0.5);                 
> //Resolution along X, Y and Z axis
>
>     v16Img->SetDataOrigin(0, 0, 0);
>
>  
>
> //****************************************************
>
> // *****  Extracting a slice from the 3D volume  *****
>
> //****************************************************
>
> *vtkImageReslice *imgResliceIn = vtkImageReslice::New();        *
>
>     imgResliceIn->SetInput(v16Img -> GetOutput());
>
>     imgResliceIn->SetOutputSpacing(1,1,1);
>
>     imgResliceIn->SetInterpolationModeToLinear();
>
>     imgResliceIn->SetOutputOrigin(0, 0, 10);
>
>     imgResliceIn->SetOutputExtent(0,312,0,499,0,0);
>
>            
>
> //****************************************************
>
> // *****        Scaling the pixel range         ******
>
> //****************************************************
>
> *vtkImageShiftScale *imgShSc =vtkImageShiftScale::New();*
>
>     imgShSc->SetInput(imgResliceIn -> GetOutput());
>
>     imgShSc->SetScale(256/13000);
>
> /// $$ The input image pixel range is from 0 to 13000./
>
> /// $$ I wanted to convert the range from (0-13000)/
>
> /// $$ to (0-255)./
>
>            
>
> //****************************************************
>
> // ***** Converting to Unsigned Char for JPEG writer *
>
> //****************************************************
>
> *vtkImageCast *imgCastIn = vtkImageCast::New();*
>
>     imgCastIn->SetInput(imgShSc -> GetOutput());
>
>     imgCastIn->SetOutputScalarTypeToUnsignedChar();          
>
>            
>
> //****************************************************
>
> *vtkJPEGWriter *jpegWrIn = vtkJPEGWriter::New();*
>
>     jpegWrIn->SetInput(imgCastIn -> GetOutput());
>
>     jpegWrIn->SetFileName("Input10.jpg");
>
>     jpegWrIn->Write();
>
> //****************************************************
>
>  
>
>  
>
> Thank you,
>
>  
>
> Ravi.
>
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-- 
Bruno da Silva de Oliveira
bruno at esss.com.br
ESSS - Engineering Simulation and Scientific Software
http://www.esss.com.br