[vtkusers] Bug in vtkTIFFReader reading multi-paged tiff file

[Maarten Beek]

Hi David,

Is it possible to show all images in a multi-paged tiff transparently?

Only when I show the 1st image (page), I see a 2nd 2d image (both are transparent).
As soon as I move to another tiff image (page), the 2d image disappears. It returns when I move back to the 1st tiff page.

The multi-paged tiff is one component, and I am thinking of an algorithm to add an alpha component, but can hardly believe this would be required...

The order of adding the actors to the renderer matters, but I try to avoid this by using transparency.

Moving one image in front of the other by changing its z-coordinate using vtkImageActor::SetPosition() doesn't help.

Maarten





On Friday, November 8, 2013 4:36:06 PM, Maarten Beek <beekmaarten at yahoo.com> wrote:
 
Hi David,

Using VTK 6.0.0, sorry ;-)

Should I send you the tiff file so you can play with it?

Now I seem to have your attention:

- How do I display a multi-page tif? I don't seem to see the different images using a vtkImageSlice.

- What would be good values for the window and level parameters? I am using window = range[1]-range[0] and level = 0.5*(range[0]+range[1]) which works ok for this multi-page tif, but gets me nowhere when I try to display a drr.

Thanks - Maarten







On Friday, November 8, 2013 4:23:23 PM, David Gobbi <david.gobbi at gmail.com> wrote:
 
Hi Maarten,

Which version of VTK are you using?  I believe that this bug has been
fixed in the master branch by a commits in the following topic merge:
http://vtk.org/gitweb?p=VTK.git;a=commitdiff;h=7e3d5270

It was not fixed in time for VTK 5.10, however.

  David



On Fri, Nov 8, 2013 at 2:12 PM, Maarten Beek <beekmaarten at yahoo.com> wrote:
> Hi all,
>
> vtkTIFFReader crashed for me while loading a multi-paged tiff file.
>
> The crash occured in vtkTIFFReader::ReadGenericImage(), because
> this->OutputExtent was not set (still NULL).
> The scalar type for the image I was loading was unsigned short, so it
> happened at line 1368.
>
> I changed void vtkTIFFReader::ReadVolume(void* buffer) into void
> vtkTIFFReader::ReadVolume(void* buffer, int outExt[6]) and added the line
> this->outputExtent = outExt.
>
> This solved my crash.
> I am not sure I am on to something, but thought to let you know.
>
> Maarten




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