# Render Background white and transparent
**URL:** https://discourse.vtk.org/t/render-background-white-and-transparent/2480
**Category:** Support
**Created:** [January 22, 2020, 12:35pm UTC](https://discourse.vtk.org/t/render-background-white-and-transparent/2480 "2020-01-22T12:35:18Z")
**Posts on this page:** 11
**Page:** 1
### Author:  [@Ana\_Margarida\_Mota](https://discourse.vtk.org/u/Ana_Margarida_Mota)
#### Post date: [January 22, 2020, 12:35pm UTC](https://discourse.vtk.org/t/render-background-white-and-transparent/2480/1 "2020-01-22T12:35:18Z")
Dear colleagues,
I need to set the render background to white (until then everything is OK with renderer-\>SetBackground(1.0,1.0,1.0)) and TRANSPARENT (otherwise my image doesn’t appear, it is everything white).
That’s the problem, I can’t manage to have a white transparten background. I am sure this should be an easy question but I didn’t find a solution for that anywhere.
Thank you in advance!!
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### Author:  [@amaclean](https://discourse.vtk.org/u/amaclean)
#### Post date: [January 24, 2020, 4:33am UTC](https://discourse.vtk.org/t/render-background-white-and-transparent/2480/3 "2020-01-24T04:33:23Z")
I have written an example for you [TransparentBackground.py](https://discourse.vtk.org/uploads/short-url/5602PREMhqASGA181RSfYpKUCI4.py) (3.5 KB) . In this a cube is rendered on a _Silver_ non-transparent background and a cone is rendered on _MidnightBlue_ background. You will see that the background is indeed _Silver_ showing that the layer one background is transparent. The proof is that the cube is visible and the background is _Silver_. I hope this example shows you what to do.
If you need a C++ version, I can translate this for you.
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### Author:  [@Ana\_Margarida\_Mota](https://discourse.vtk.org/u/Ana_Margarida_Mota)
#### Post date: [February 10, 2020, 3:04pm UTC](https://discourse.vtk.org/t/render-background-white-and-transparent/2480/4 "2020-02-10T15:04:52Z")
Dear Andrew Maclean,
Is was very useful!! thank you!!
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### Author:  [@lllaa](https://discourse.vtk.org/u/lllaa)
#### Post date: [June 18, 2020, 9:51am UTC](https://discourse.vtk.org/t/render-background-white-and-transparent/2480/5 "2020-06-18T09:51:35Z")
Dear Andrew Maclean,
I need a C++ version .Hope you can translate it for me .Thank you.
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### Author:  [@amaclean](https://discourse.vtk.org/u/amaclean)
#### Post date: [June 18, 2020, 10:14am UTC](https://discourse.vtk.org/t/render-background-white-and-transparent/2480/6 "2020-06-18T10:14:11Z")
I’ll have a look tomorrow and get back to you. I’m pretty sure I added a C++ version to the VTKExamples master.
Andrew Maclean
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### Author:  [@lllaa](https://discourse.vtk.org/u/lllaa)
#### Post date: [June 18, 2020, 10:15am UTC](https://discourse.vtk.org/t/render-background-white-and-transparent/2480/7 "2020-06-18T10:15:45Z")
Thank you🙏
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### Author:  [@lllaa](https://discourse.vtk.org/u/lllaa)
#### Post date: [June 18, 2020, 10:53am UTC](https://discourse.vtk.org/t/render-background-white-and-transparent/2480/8 "2020-06-18T10:53:34Z")
If you had the C++ version already,can you send me a web link? I’d searched your nickname in github but not found.
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### Author:  [@amaclean](https://discourse.vtk.org/u/amaclean)
#### Post date: [June 18, 2020, 11:34pm UTC](https://discourse.vtk.org/t/render-background-white-and-transparent/2480/9 "2020-06-18T23:34:33Z")
@lllaa Here are the files: [TransparentBackground.zip](https://discourse.vtk.org/uploads/short-url/3Hlp6NMpnF10Hhqm8ZX9JBt3Mr5.zip) (4.1 KB) . I have also included an updated Python version here. Sometime, over the next few days, I will add these to the VTKExamples site where you will find them in the `Rendering` section.
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### Author:  [@amaclean](https://discourse.vtk.org/u/amaclean)
#### Post date: [June 19, 2020, 12:04am UTC](https://discourse.vtk.org/t/render-background-white-and-transparent/2480/10 "2020-06-19T00:04:30Z")
It is now in the VTKExamples master. Unfortunately at this stage it will not appear on the web pages. If you ckeck out `VTKExamples`, look for `src/Python/Rendering/TransparentBackground.py` and `src/Cxx/Rendering/TransparentBackground.cxx`.
Regards
Andrew
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### Author:  [@lllaa](https://discourse.vtk.org/u/lllaa)
#### Post date: [June 19, 2020, 7:16am UTC](https://discourse.vtk.org/t/render-background-white-and-transparent/2480/12 "2020-06-19T07:16:39Z")
a
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### Author:  [@lllaa](https://discourse.vtk.org/u/lllaa)
#### Post date: [June 19, 2020, 7:18am UTC](https://discourse.vtk.org/t/render-background-white-and-transparent/2480/13 "2020-06-19T07:18:03Z")
Dear Andrew Maclean,
thank for your help.May I ask you another question?
I used QvtkWidget in QT designer.
But the QvtkWidget had a black background when I created it on the “MainWindow”.It makes my photo has a black background.
I want to make the black background diappeared.But I failed to find the way from your code.
I put the pics below.
Wish for your reply.
 