# How to disable the low pass filter effect on vtkImageViewer2?

**URL:** https://discourse.vtk.org/t/how-to-disable-the-low-pass-filter-effect-on-vtkimageviewer2/4759
**Category:** Support
**Created:** [December 1, 2020, 8:57am UTC](https://discourse.vtk.org/t/how-to-disable-the-low-pass-filter-effect-on-vtkimageviewer2/4759 "2020-12-01T08:57:30Z")
**Posts on this page:** 3
**Page:** 1

<div class="post-metadata">

### Author: ![Kim\_William](https://discourse.vtk.org/user_avatar/discourse.vtk.org/kim_william/32/373_2.png) [@Kim\_William](https://discourse.vtk.org/u/Kim_William)
#### Post date: [December 1, 2020, 8:57am UTC](https://discourse.vtk.org/t/how-to-disable-the-low-pass-filter-effect-on-vtkimageviewer2/4759/1 "2020-12-01T08:57:30Z")

</div>

Hi all 🙂

I have a question about vtkImageViewer2.

I have tested loading and drawing an image with the sample code.  
Link: [https://lorensen.github.io/VTKExamples/site/Cxx/Images/StaticImage/](https://lorensen.github.io/VTKExamples/site/Cxx/Images/StaticImage/)

It works well except for one thing.  
The shown image looks like to be applied low pass filter effect.  
vtkImageViewer2:

 ![blur](https://discourse.vtk.org/uploads/default/original/2X/5/527c5677885cadaefa40653a69ab3dd3756719dd.png)  
original:  
 ![original](https://discourse.vtk.org/uploads/default/original/2X/6/6e04687ce0bbe3aee54477c5df9d242807e00e7e.png)

How to disable this effect?

Could you please give me an advise for me?

Thank you 🙂

---

<div class="post-metadata">

### Author: ![dgobbi](https://discourse.vtk.org/user_avatar/discourse.vtk.org/dgobbi/32/18_2.png) [@dgobbi](https://discourse.vtk.org/u/dgobbi)
#### Post date: [December 1, 2020, 6:33pm UTC](https://discourse.vtk.org/t/how-to-disable-the-low-pass-filter-effect-on-vtkimageviewer2/4759/2 "2020-12-01T18:33:37Z")

</div>

Maybe you just need to increase the window size so that it’s at least as large as the image size? E.g:

```auto
imageViewer->GetRenderWindow()->SetSize(780, 780);

```

Edit: also, it’s possible that what you are seeing is antialiasing, not actual blurring. Try turning off interpolation to see if that helps.

```auto
imageViewer->GetImageActor()->GetProperty()->SetInterpolationTypeToNearest();

```

---

<div class="post-metadata">

### Author: ![Kim\_William](https://discourse.vtk.org/user_avatar/discourse.vtk.org/kim_william/32/373_2.png) [@Kim\_William](https://discourse.vtk.org/u/Kim_William)
#### Post date: [December 2, 2020, 1:16am UTC](https://discourse.vtk.org/t/how-to-disable-the-low-pass-filter-effect-on-vtkimageviewer2/4759/3 "2020-12-02T01:16:04Z")

</div>

Hi David.  
Thank you for your help!

I can resolve this problem by using ‘SetInterpolationTypeToNearest()’.

Thank you 🙂

Have a nice day!