# Assign an existing buffer to a new itk::Image instance

**URL:** https://discourse.itk.org/t/assign-an-existing-buffer-to-a-new-itk-image-instance/7335
**Category:** Beginner Questions
**Created:** [December 2, 2024, 11:12am UTC](https://discourse.itk.org/t/assign-an-existing-buffer-to-a-new-itk-image-instance/7335 "2024-12-02T11:12:12Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![Oodini](https://discourse.itk.org/letter_avatar_proxy/v4/letter/o/db5fbb/32.png) [@Oodini](https://discourse.itk.org/u/Oodini)
#### Post date: [December 2, 2024, 11:12am UTC](https://discourse.itk.org/t/assign-an-existing-buffer-to-a-new-itk-image-instance/7335/1 "2024-12-02T11:12:12Z")

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Hello,

I am supposed to process images coming from an echograph. They do not come from a file, but from a graphic card buffer.  
How can I set these existing data as `LargestPossibleRegion`, without copyning them ?

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### Author: ![zivy](https://discourse.itk.org/user_avatar/discourse.itk.org/zivy/32/1726_2.png) [@zivy](https://discourse.itk.org/u/zivy)
#### Post date: [December 2, 2024, 1:43pm UTC](https://discourse.itk.org/t/assign-an-existing-buffer-to-a-new-itk-image-instance/7335/2 "2024-12-02T13:43:49Z")

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Hello @Oodini,

[This discussion](https://discourse.itk.org/t/reading-writing-images-to-from-memory-rather-than-files/3763) is likely relevant to what you want to do.

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### Author: ![Oodini](https://discourse.itk.org/letter_avatar_proxy/v4/letter/o/db5fbb/32.png) [@Oodini](https://discourse.itk.org/u/Oodini)
#### Post date: [December 2, 2024, 2:08pm UTC](https://discourse.itk.org/t/assign-an-existing-buffer-to-a-new-itk-image-instance/7335/3 "2024-12-02T14:08:18Z")

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It seens I need to use `ImportImageFilter`. Thanks.