> ## Documentation Index
> Fetch the complete documentation index at: https://support.lumafield.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Renormalization

> Extract and expand a specific range of attenuation values with renormalization to perceive greater detail in multi-material scans.

Volumetric scan data is stored as a rectangular prism of voxels that each have an attenuation value. The high-resolution source volume contains more voxels as well as more color depth than the Voyager Project Editor can support.

The cropping step of the [ROI Tool](/voyager/voyager-region-of-interest) allows you to choose a spatial region of interest of your part that you wish to see in high resolution. In a similar way, the Renormalization step allows you to choose a subset of attenuation values that is most useful to you. Renormalization works by selecting a lower bound and an upper bound on attenuation values of interest, and clipping values outside this range - making the colors you see in the data more useful. The next section explains how to control this clipping.

<h2 id="understanding-the-renormalization-options">
  Understanding the Renormalization Options
</h2>

There are three options in the Renormalize section of the ROI tool: **Default Range, Selected Range and Full Data Range**. 

1. **Default Range:** Refers to the default normalization that Voyager applies to volumes after they have been created. Use this option to "reset" the volume to what Voyager typically displays for a data object.
2. **Selected Range:** Refers to the user-specified values that the rangemapper and visualization show. Use this to choose a specific range of your data to renormalize to.
3. **Full Data Range:** Refers to the raw, unclipped data. Use this if you believe the default range has clipped important data from your scan. This is possible with extremely high variation multi-material datasets where your application requires resolution of extremely different materials in one scan. 

<Tip>
  Selecting "Full Data Range" expands the normalization beyond default settings. Outliers in the unclipped data can have a large impact on the resulting data object.
</Tip>

<h3 id="renormalizing-selected-ranges">
  Renormalizing Selected Ranges
</h3>

The below scan shows a standard low attenuation / high attenuation split. Renormalization allows you to isolate more dense and less dense material into separate data objects for individual analysis.

<img height="200" src="https://mintcdn.com/lumafield/RAKLLWpNuwH0H4hN/images/Renorm.gif?s=395b44660598d5ce8e9a13af66529cd9" alt="" title="" data-path="images/Renorm.gif" />