# reader update

**URL:** https://discourse.vtk.org/t/reader-update/6668
**Category:** Support
**Created:** [September 22, 2021, 1:40am UTC](https://discourse.vtk.org/t/reader-update/6668 "2021-09-22T01:40:49Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![WZYSIUI](https://discourse.vtk.org/user_avatar/discourse.vtk.org/wzysiui/32/3976_2.png) [@WZYSIUI](https://discourse.vtk.org/u/WZYSIUI)
#### Post date: [September 22, 2021, 1:40am UTC](https://discourse.vtk.org/t/reader-update/6668/1 "2021-09-22T01:40:50Z")

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I use the vtkImageimport interface to use the same pointer to pass in data for body drawing, the first time the pointer address grayscale range is 0 to 128, color map is 0 to 255, the second time to modify the pointer internal data range to 0 to 255, or the original color map, but this time the body color map is only 0 to 128.  
This time the reader to perform modified interface can solve this problem,but would like to ask why there is this situation