[vtkusers] vtkPNGreader

[yala kaluma]

Thanks Amy,

i understand that VTK is a well built program that has been around for quite 
a long time and that it is really unlikely for a newbie like I am to find a 
bug...

But it still does not work.

Here is the error message I recieve:

Building dependencies cmake.check_depends...
-- Loading VTK CMake commands
-- Loading VTK CMake commands - done
Building object file read.o...

Building executable /home/yala/VTK/Examples/myshit/vizu/read...
read.o(.text+0x11): In function `main':
: undefined reference to `vtkPNGReader::New()'

collect2: ld returned 1 exit status
make[1]: *** [/home/yala/VTK/Examples/myshit/vizu/read] Erreur 1
make: *** [default_target] Erreur 2


What could I do?

Yala





Hi Yala,

The image readers and writers in VTK work fine.  Your 1st problem is that
fullhead15.png is stores its data as unsigned short, but uses a small
portion of that range.  (The full range is 0 - 65535, and the maximum value
in the image is 3714.)  To view the image in this range, you need to use
the SetColorWindow and SetColorLevel method of the vtkImageViewer.  (Window
is the difference between the smallest and largest value you want to view,
and level is the value at the midpoint of that range.)  Add the following
lines after viewer->SetInput...

viewer->SetColorWindow(3714);
viewer->SetColorLevel(1857);

Also, tests are run every night that cover most of VTK, so it is unlikely
that an entire class in a VTK release is completely untested.

- Amy

At 12:33 PM 3/24/2005, yala kaluma wrote:
>It seems like VTK's PNG,JPEG and PNG reader do not work.
>Anybody has ever used it???
>
>When I run the program below it seems like it toes not recognize the class 
>vtkPNGReader!
>
>And I am having the same problem with the image writers...
>
>Am i doing something wrong?
>
>#include "vtkPNGReader.h"
>#include "vtkImageViewer.h"
>#include "vtkRenderWindow.h"
>
>int main( int argc, char *argv[] )
>{
>vtkPNGReader *pngReader=vtkPNGReader::New();
>pngReader->SetFileName("/home/yala/VTKData-release-4-2/Data/fullhead15.png");
>
>vtkImageViewer *viewer=vtkImageViewer::New();
>viewer->SetInput(pngReader->GetOutput());
>viewer->Render();
>
>  int i;
>  for (i = 0; i < 360; ++i)
>    {
>    viewer->Render();
>    }
>
>pngReader->Delete();
>viewer->Delete();
>
>  return 0;
>}
>
>
>Thanks!!!!!!!!!
>
>_____

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