# vtk how to prevent the blur edge?

**URL:** https://discourse.vtk.org/t/vtk-how-to-prevent-the-blur-edge/9484
**Category:** Support
**Created:** [September 28, 2022, 9:52am UTC](https://discourse.vtk.org/t/vtk-how-to-prevent-the-blur-edge/9484 "2022-09-28T09:52:25Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![zhang-qiang-github](https://discourse.vtk.org/user_avatar/discourse.vtk.org/zhang-qiang-github/32/2519_2.png) [@zhang-qiang-github](https://discourse.vtk.org/u/zhang-qiang-github)
#### Post date: [September 28, 2022, 9:52am UTC](https://discourse.vtk.org/t/vtk-how-to-prevent-the-blur-edge/9484/1 "2022-09-28T09:52:25Z")

</div>

I want to display a color image and a gray image.

 ![image](https://discourse.vtk.org/uploads/default/original/2X/6/65349ee594b71b0fa32f241f4c279cadb46915d6.png)

The code is about (python):

```auto

grayActor = ...
colorActor = ...

render.AddActor(grayActor)
render.AddActor(colorActor )

```

And the result is shown as the above picture.

The color image is actually a green color, but red edge appear.

How to prevent the blur red edge?

Any suggestion is appreciated~~~