[vtkusers] Bugs in vtkImageData and vtkTiffWriter

[Andinet Enquobahrie]

Enkelejda Tafaj wrote:

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

> How about the bugs in vtkTIFFWriter?
>
I will take a look at it and get back to you.

-Andinet

>
>
>
>
> 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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>>
>>
>
>


-- 
==========================================================
Andinet A. Enquobahrie, PhD
R&D Engineer
Kitware Inc.

28 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-371-3971 x124
www.kitware.com