# Write a Scene to png
**URL:** https://discourse.vtk.org/t/write-a-scene-to-png/11392
**Category:** Support
**Created:** [May 6, 2023, 12:27am UTC](https://discourse.vtk.org/t/write-a-scene-to-png/11392 "2023-05-06T00:27:09Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Parisa\_Rabbani](https://discourse.vtk.org/u/Parisa_Rabbani)
#### Post date: [May 6, 2023, 12:27am UTC](https://discourse.vtk.org/t/write-a-scene-to-png/11392/1 "2023-05-06T00:27:09Z")
Hi!
I have a vtkchart plot, I am trying to write my plot as png. It seems like “vtkWindowToImageFilter” has some issue. I get the following error:
Any help would be much appreciated.
Best,
Parisa
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### Author:  [@Jens\_Munk\_Hansen](https://discourse.vtk.org/u/Jens_Munk_Hansen)
#### Post date: [May 6, 2023, 5:50pm UTC](https://discourse.vtk.org/t/write-a-scene-to-png/11392/2 "2023-05-06T17:50:05Z")
Difficult to see from a screenshot without context. I can see on the image that you assign both input data and an input connection to a writer. That is not right
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### Author:  [@Parisa\_Rabbani](https://discourse.vtk.org/u/Parisa_Rabbani)
#### Post date: [May 8, 2023, 4:00pm UTC](https://discourse.vtk.org/t/write-a-scene-to-png/11392/3 "2023-05-08T16:00:31Z")
I removed the image data assignment to the writer. I still have the issue. Please see part of the code that crashed below:
Here’s the screenshot of the error:
This is the plot I am trying to write as png, (window size: (1000,1000))
Any help would be much appreciated.
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### Author:  [@Jens\_Munk\_Hansen](https://discourse.vtk.org/u/Jens_Munk_Hansen)
#### Post date: [May 9, 2023, 4:39pm UTC](https://discourse.vtk.org/t/write-a-scene-to-png/11392/4 "2023-05-09T16:39:23Z")
I believe you need to render the window after you have configured the filter to work on its output. The `vtkWindowToImageFilter` you assign an input not a connection.
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### Author:  [@geoffw](https://discourse.vtk.org/u/geoffw)
#### Post date: [May 19, 2023, 4:17am UTC](https://discourse.vtk.org/t/write-a-scene-to-png/11392/5 "2023-05-19T04:17:18Z")
You could try pulling the data out manually and see what you get. We do something like this by starting with this:
```
vtkImageData *imageData = windowToImageFilter->GetOutput();
int dims[3] = {0};
imageData->GetDimensions(dims);
int tnSize = dims[0] * dims[1] * 4;
uchar *rgba = (uchar *)imageData->GetScalarPointer();
std::vector rgb(rgba, rgba + tnSize);
```
…
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### Author:  [@Parisa\_Rabbani](https://discourse.vtk.org/u/Parisa_Rabbani)
#### Post date: [May 19, 2023, 4:33pm UTC](https://discourse.vtk.org/t/write-a-scene-to-png/11392/6 "2023-05-19T16:33:12Z")
Thank you Geoff.
The issue got solved. I found out I had mismatched debug and release libraries. So I changed all to debug and the writing issue got fixed.
I faced another problem after this, I couldn’t add labels to x or y axis in debug mode.
Which till this day I am not sure why, but using cmake for linking and initializing fixed that as well. I am guessing I should have used autoinit for something but anyways cmake fixed it.