# Signed vs. unsigned pixel data in DICOMAppHelper

**URL:** https://discourse.vtk.org/t/signed-vs-unsigned-pixel-data-in-dicomapphelper/955
**Category:** Development
**Created:** [May 13, 2019, 5:23pm UTC](https://discourse.vtk.org/t/signed-vs-unsigned-pixel-data-in-dicomapphelper/955 "2019-05-13T17:23:19Z")
**Posts on this page:** 1
**Showing post:** 5

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### Author: ![jfollweiler](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/j/8edcca/32.png) [@jfollweiler](https://discourse.vtk.org/u/jfollweiler)
#### Post date: [May 14, 2019, 6:25pm UTC](https://discourse.vtk.org/t/signed-vs-unsigned-pixel-data-in-dicomapphelper/955/5 "2019-05-14T18:25:04Z")

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Thanks for the suggestion. I added the CMake variable but I get a CMake warning that the variable was not used. The same warning seen [here](https://discourse.vtk.org/t/error-while-enabling-the-vtkdicom-module-in-vtk-8-2-0/753). I’m building VTK 8.2.0 as well.

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