[vtkusers] Bugs in vtkImageData and vtkTiffWriter

[Enkelejda Tafaj]

Thank you Ardinet, it was the SetOrientationType that was missing in my 
program.

How about the bugs in vtkTIFFWriter?

Enkelejda




Andinet Enquobahrie wrote:
> Hello Enkelejda,
> 
> We recently updated the tiff library version to libtiff 3.8.2 in 
> VTK-CVS. Concurrently, we
> updated the TIFF image reader (vtkTIFFReader).
> 
> The flipped image that you are observing is probably due to the use of 
> the orientation tag
> in your input image data. The new reader parses and uses orientation tag 
> if available in the image
> data. The old reader always ignores orientation tag and forces 
> ORIENATION_BOTLEFT
> ( row 0 bottom, col 0 lhs ) type. For convenience,  we have added a 
> SetOrientationType
> method that you could invoke to force any orientation you are interested.
> 
> /* Set orientation type  ORIENTATION_TOPLEFT         1       (row 0 top, 
> col 0 lhs)
>  ORIENTATION_TOPRIGHT        2       (row 0 top, col 0 rhs)
>  ORIENTATION_BOTRIGHT        3       (row 0 bottom, col 0 rhs)
>  ORIENTATION_BOTLEFT         4       (row 0 bottom, col 0 lhs)
>  ORIENTATION_LEFTTOP         5       (row 0 lhs, col 0 top)
>  ORIENTATION_RIGHTTOP        6       (row 0 rhs, col 0 top)
>  ORIENTATION_RIGHTBOT        7       (row 0 rhs, col 0 bottom)
>  ORIENTATION_LEFTBOT         8       (row 0 lhs, col 0 bottom) */  void 
> SetOrientationType( unsigned int orientationType );
>  vtkGetMacro( OrientationType, unsigned int );
> 
> 
> For instance, the "beach.tif" image that is used in several of the tests 
> in VTK
> contains ORIENTATION_TOPLEFT tag. However, the old reader ignores this
> tags and all the baseline images where generated with ORIENATION_BOTLEFT
> orientation. Hence, to make sure all the regression tests pass after 
> updating the reader
> and the tiff library ( without changing the baseline images), we have 
> added SetOrientationType
> method invocation in all the tests that use this image file.
> 
> You can do the same thing in your example to orient the image to your need.
> 
> -Andinet
> 
> 
>> Hi,
>>
>> last week I updated to the CVS VTK.
>>
>> Today I noticed that the class vtkImageData (or some other filtering 
>> base class) is buggy. When trying to filter tif-images data with the 
>> vtkSimpleImageFilterExample (SimpleImageFilterExample creates a copy 
>> of the input data) the result is wrong. The output images are flipped.
>>
>> Any idea what is wrong?
>>
>>
>> Btw: the vtkTiffWriter.* still doesn't allow to write tif images. I 
>> used the patch proposed some times ago (see below, but the best would 
>> be to update the CVS files
>>
>> RCS file: /cvsroot/VTK/VTK/IO/vtkTIFFWriter.cxx,v
>> retrieving revision 1.41
>> diff -r1.41 vtkTIFFWriter.cxx
>> 124c124,125
>> <   TIFF* tif = TIFFClientOpen(this->GetFileName(), "w",
>> ---
>> >   //  TIFF* tif = TIFFClientOpen(this->GetFileName(), "w",
>> >   TIFF* tif = TIFFClientOpen(this->InternalFileName, "w",
>>
>>
>>
>> Thank you for you help.
>> Enkelejda
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> 
>