MantisBT - VTK
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IDProjectCategoryView StatusDate SubmittedLast Update
0013495VTK(No Category)public2012-10-08 08:002012-12-04 09:46
ReporterSeungbum Koo 
Assigned ToDavid Gobbi 
PriorityhighSeverityminorReproducibilityhave not tried
StatusclosedResolutionunable to reproduce 
PlatformOSOS Version
Product Version5.8.0 
Target VersionFixed in Version 
ProjectTBD
Typeincorrect functionality
Summary0013495: vtkImageActor image shift
DescriptionImage is shifted by one or two pixels in vtkImageActor. It is observed in 5.8.0 and 5.10.0. When I tested it using a color picture then it looks like color layers shift differently.

Attached is a test result using a 20x10 pixel BMP image (24bit, made in PhotoShop) with some grids. Left image is the original image and the right image is the image on vtkImageActor through the following pipeline. You can see a strangely shifted image.

vtkBMPReader
vtkImageShiftScale
vtkImageShiftScale.SetOutputScalarTypeToUnsignedChar()
vtkImageData
vtkImageActor
vtkImageActor.InterpolateOff()
Steps To Reproduce
Additional Information
TagsNo tags attached.
Relationships
Attached Filespng vtkimageactor_problem.PNG (51,491) 2012-10-08 08:00
https://www.vtk.org/Bug/file/9294/vtkimageactor_problem.PNG
png

png imageactor.png (15,478) 2012-10-29 23:11
https://www.vtk.org/Bug/file/9324/imageactor.png
png
Issue History
Date ModifiedUsernameFieldChange
2012-10-08 08:00Seungbum KooNew Issue
2012-10-08 08:00Seungbum KooFile Added: vtkimageactor_problem.PNG
2012-10-29 23:11David GobbiFile Added: imageactor.png
2012-10-29 23:25David GobbiNote Added: 0029587
2012-10-29 23:27David GobbiNote Edited: 0029587bug_revision_view_page.php?bugnote_id=29587#r513
2012-12-04 09:45David GobbiAssigned To => David Gobbi
2012-12-04 09:45David GobbiStatusbacklog => tabled
2012-12-04 09:45David GobbiStatustabled => closed
2012-12-04 09:46David GobbiResolutionopen => unable to reproduce

Notes
(0029587)
David Gobbi   
2012-10-29 23:25   
(edited on: 2012-10-29 23:27)
I cannot reproduce this bug. I grabbed a screenshot of your test image, resized it to 10x20, saved it as a png file, and displayed it with vtkImageActor. The result is shown in imageactor.png. The rendered result is identical to the original image (except for the border, which can be rendered by calling vtkImageActor->GetMapper()->BorderOn()).

I suspect that the problem is due to incompatibility between your BMP file and the vtkBMPReader. Try using a different file format (PNG, TIFF, JPEG or PNM).