# Is there any way I can get the corresponding image before rendering volume to the window

**URL:** https://discourse.vtk.org/t/is-there-any-way-i-can-get-the-corresponding-image-before-rendering-volume-to-the-window/4172
**Category:** Support
**Created:** [September 8, 2020, 8:30am UTC](https://discourse.vtk.org/t/is-there-any-way-i-can-get-the-corresponding-image-before-rendering-volume-to-the-window/4172 "2020-09-08T08:30:20Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![funstuff](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/f/c0e974/32.png) [@funstuff](https://discourse.vtk.org/u/funstuff)
#### Post date: [September 8, 2020, 8:30am UTC](https://discourse.vtk.org/t/is-there-any-way-i-can-get-the-corresponding-image-before-rendering-volume-to-the-window/4172/1 "2020-09-08T08:30:20Z")

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dear all，  
I want to know if VTK provides any method to save the image rendered by vtkSmartVolumeMapper. I know vtkWindowToImageFilter, but its implementation requires rendering data to the window,the effect is similar to screenshots. Is there any way can be directly exported to vtkimagedata, or a similar data format,without randering data to window?  
thanks

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### Author: ![lassoan](https://discourse.vtk.org/user_avatar/discourse.vtk.org/lassoan/32/50_2.png) [@lassoan](https://discourse.vtk.org/u/lassoan)
#### Post date: [September 8, 2020, 7:42pm UTC](https://discourse.vtk.org/t/is-there-any-way-i-can-get-the-corresponding-image-before-rendering-volume-to-the-window/4172/2 "2020-09-08T19:42:08Z")

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The feature that you are looking for is called “off-screen rendering”. VTK supports this. Google search for this keyword should help you getting started.