# region of interest

**URL:** https://discourse.itk.org/t/region-of-interest/3451
**Category:** Beginner Questions
**Tags:** registration
**Created:** [September 9, 2020, 8:05am UTC](https://discourse.itk.org/t/region-of-interest/3451 "2020-09-09T08:05:56Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![mumu](https://discourse.itk.org/letter_avatar_proxy/v4/letter/m/977dab/32.png) [@mumu](https://discourse.itk.org/u/mumu)
#### Post date: [September 9, 2020, 8:05am UTC](https://discourse.itk.org/t/region-of-interest/3451/1 "2020-09-09T08:05:56Z")

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In the ImageReadRegionOfInterestWrite.cxx example, where start[0]=atoi(argv[3]);start[1]=atoi(argv[4]);size[0]=atoi([argv[5]]);size [1]=atoi([argv[6]]) What should I fill in?

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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: [September 9, 2020, 2:57pm UTC](https://discourse.itk.org/t/region-of-interest/3451/2 "2020-09-09T14:57:05Z")

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That depends on the size of the image you are providing, but you can try this: `10 30 200 150`.