# Normalization (histogram pre and post)

**URL:** <https://discourse.slicer.org/t/normalization-histogram-pre-and-post/25727>\
**Category:** Support\
**Tags:** python\
**Created:** [October 17, 2022, 1:31am UTC](https://discourse.slicer.org/t/normalization-histogram-pre-and-post/25727 "2022-10-17T01:31:23Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Josefa\_Garcia](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/josefa_garcia/32/13792_2.png) [@Josefa\_Garcia](https://discourse.slicer.org/u/Josefa_Garcia)\
**Post date:** [October 17, 2022, 1:31am UTC](https://discourse.slicer.org/t/normalization-histogram-pre-and-post/25727/1 "2022-10-17T01:31:23Z")

</div>

Why after apply the normalization using pyradiomics the images doesn’t change their histogram? or it is not supposed to modify the original image (mask)? thanks