[Paraview] Saving image in VTK format

[Sara Rolfe]

Thanks for your reply!  I'm not having any trouble reading the  
original unstructured points as an image, but I didn't see why the  
data type was getting switched to an unstructured grid.

Now I've realize this was done by ExtractCellsByRegion, which makes  
sense.  I switched to Extract Subset, which outputs structured points,  
and this works just fine.  However, the ROI selection is pretty  
limited since it only allows the selection using a cube, from what I  
can tell.  I've also tried Extract Selection, but Paraview crashes  
each time I try to use the selection tools.

Any tips on a better way to do this would be appreciated!

Sara


On Sep 21, 2010, at 1:12 PM, Moreland, Kenneth wrote:

> VTK has a data type called structured grid that is different than  
> image data (and also different than unstructured grid).  If ParaView  
> is not telling you that your data is image data or a uniform grid,  
> then the data you write out will be necessarily incompatible with  
> reading it as an image file.
>
> -Ken
>
>
> On 9/21/10 11:55 AM, "Sara Rolfe" <smrolfe at u.washington.edu> wrote:
>
> Hello,
>
> I'm new to Paraview and am trying to use it to edit a VTK image.  My
> original image is in the structured points format.  I'm using the
> ExtractCellsByRegion filter to select a subset, which I save using
> Save Data with a VTK extension like the original.  However, I could
> not open this file using the ITK ImageFileReader.  I believe this is
> because the VTK file was saved as an unstructured grid instead of
> structured points.
>
> Does anyone know why this is happening and how to change it?  I can
> look at converting it using ITK, but I'd like to know if there's a
> better solution.
>
> Thanks,
> Sara
>
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