# In parallel environment, can VTK remove the background of rendering?
**URL:** https://discourse.vtk.org/t/in-parallel-environment-can-vtk-remove-the-background-of-rendering/4034
**Category:** Support
**Created:** [August 21, 2020, 3:45am UTC](https://discourse.vtk.org/t/in-parallel-environment-can-vtk-remove-the-background-of-rendering/4034 "2020-08-21T03:45:17Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Pandapan](https://discourse.vtk.org/u/Pandapan)
#### Post date: [August 21, 2020, 3:45am UTC](https://discourse.vtk.org/t/in-parallel-environment-can-vtk-remove-the-background-of-rendering/4034/1 "2020-08-21T03:45:17Z")
I am trying to using VTK for parallel rendering. The problem is that the background will cause errors during image composition.
For example, I use two processes to render two images (A and B), respectively. When these two images are composited, I found that they have their own backgrounds. These two backgrounds lead to a wrong composited image.So，I wonder if VTK can remove the background of rendering in parallel environment?
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### Author:  [@Pandapan](https://discourse.vtk.org/u/Pandapan)
#### Post date: [August 21, 2020, 3:46am UTC](https://discourse.vtk.org/t/in-parallel-environment-can-vtk-remove-the-background-of-rendering/4034/2 "2020-08-21T03:46:13Z")
I am looking forward to your reply!
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### Author:  [@bichongke](https://discourse.vtk.org/u/bichongke)
#### Post date: [August 22, 2020, 1:57pm UTC](https://discourse.vtk.org/t/in-parallel-environment-can-vtk-remove-the-background-of-rendering/4034/4 "2020-08-22T13:57:29Z")
we have the same problem.
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### Author:  [@Pandapan](https://discourse.vtk.org/u/Pandapan)
#### Post date: [August 23, 2020, 2:48am UTC](https://discourse.vtk.org/t/in-parallel-environment-can-vtk-remove-the-background-of-rendering/4034/5 "2020-08-23T02:48:08Z")
I look forward to your help to solve this problem
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### Author:  [@Pandapan](https://discourse.vtk.org/u/Pandapan)
#### Post date: [August 24, 2020, 5:09am UTC](https://discourse.vtk.org/t/in-parallel-environment-can-vtk-remove-the-background-of-rendering/4034/6 "2020-08-24T05:09:17Z")
This problem still exists. Does anyone encounter this problem?
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### Author:  [@Pandapan](https://discourse.vtk.org/u/Pandapan)
#### Post date: [August 26, 2020, 6:44am UTC](https://discourse.vtk.org/t/in-parallel-environment-can-vtk-remove-the-background-of-rendering/4034/7 "2020-08-26T06:44:27Z")
+1