# Nii saving (bit range)

**URL:** <https://discourse.slicer.org/t/nii-saving-bit-range/3948>\
**Category:** Support\
**Created:** [August 30, 2018, 1:45pm UTC](https://discourse.slicer.org/t/nii-saving-bit-range/3948 "2018-08-30T13:45:20Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Heiko\_Stark](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/heiko_stark/32/69446_2.png) [@Heiko\_Stark](https://discourse.slicer.org/u/Heiko_Stark)\
**Post date:** [August 30, 2018, 1:45pm UTC](https://discourse.slicer.org/t/nii-saving-bit-range/3948/1 "2018-08-30T13:45:20Z")

</div>

Operating system: Linux  
Slicer version: 4.8  
Expected behavior: smallest bit resolution in nii file  
Actual behavior: signed int32

My data are in the range of -2000…7000.  
How can I modify it?

---

<div class="post-metadata">

**Author:** ![Sam\_Horvath](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sam_horvath/32/3092_2.png) [@Sam\_Horvath](https://discourse.slicer.org/u/Sam_Horvath)\
**Post date:** [August 30, 2018, 2:17pm UTC](https://discourse.slicer.org/t/nii-saving-bit-range/3948/2 "2018-08-30T14:17:12Z")

</div>

You can use the Cast Scalar Volume module to change the data to a smaller bit resolution. It will not auto detect the smallest, you will need to pick what resolution you want to cast it to.

---

<div class="post-metadata">

**Author:** ![Heiko\_Stark](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/heiko_stark/32/69446_2.png) [@Heiko\_Stark](https://discourse.slicer.org/u/Heiko_Stark)\
**Post date:** [August 31, 2018, 1:41pm UTC](https://discourse.slicer.org/t/nii-saving-bit-range/3948/3 "2018-08-31T13:41:40Z")

</div>

Thanks!

I will use unsigned short.