# Processing two images with different starts

**URL:** https://discourse.itk.org/t/processing-two-images-with-different-starts/5451
**Category:** Beginner Questions
**Created:** [October 26, 2022, 11:46pm UTC](https://discourse.itk.org/t/processing-two-images-with-different-starts/5451 "2022-10-26T23:46:50Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Oddone-Scatena](https://discourse.itk.org/user_avatar/discourse.itk.org/oddone-scatena/32/2651_2.png) [@Oddone-Scatena](https://discourse.itk.org/u/Oddone-Scatena)
#### Post date: [October 26, 2022, 11:46pm UTC](https://discourse.itk.org/t/processing-two-images-with-different-starts/5451/1 "2022-10-26T23:46:50Z")

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I have 2 images with the same size but with different starts. I want use one as a mask.

Should I use import image filter first to set the same start for both of them?

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### Author: ![dzenanz](https://discourse.itk.org/user_avatar/discourse.itk.org/dzenanz/32/1093_2.png) [@dzenanz](https://discourse.itk.org/u/dzenanz)
#### Post date: [October 27, 2022, 1:15pm UTC](https://discourse.itk.org/t/processing-two-images-with-different-starts/5451/2 "2022-10-27T13:15:04Z")

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You don’t need import filter. Updating the regions’ index can be done on an ITK image. But you should figure out whether that is the right thing to do - visualize for the image and mask together in Slicer to figure it out.