# How to distinguish between translation, scaling and reduction by DIR

**URL:** <https://discourse.slicer.org/t/how-to-distinguish-between-translation-scaling-and-reduction-by-dir/20412>\
**Category:** Support\
**Created:** [October 29, 2021, 10:59am UTC](https://discourse.slicer.org/t/how-to-distinguish-between-translation-scaling-and-reduction-by-dir/20412 "2021-10-29T10:59:30Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![toyama](https://avatars.discourse-cdn.com/v4/letter/t/82dd89/32.png) [@toyama](https://discourse.slicer.org/u/toyama)\
**Post date:** [October 29, 2021, 10:59am UTC](https://discourse.slicer.org/t/how-to-distinguish-between-translation-scaling-and-reduction-by-dir/20412/1 "2021-10-29T10:59:30Z")

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I want to distinguish between translation, enlargement, and reduction by DIR for each contour.  
When I asked about this before, I was told that there is a tool called bounding box that can be used to determine scaling, as shown in the image.  
Is this to compare the reference image with the transformed image?

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/e/e/ee25229657f09e296094bec8d2e2f786cbe4f936.png)  
When I look at the Slicer, I see that this tool gives values for x, y, and z. How should I interpret these values to determine scaling and translation?  
Also, this tool is only for scalar volumes, but is there any way to apply it to DVF?  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/3/d/3dbf0cc63e9159c35a09f43f5d80bb44dfa2cd6f.png)