# Volume rendering on log scale switches to grayscale map

**URL:** https://discourse.paraview.org/t/volume-rendering-on-log-scale-switches-to-grayscale-map/17491
**Category:** Development
**Created:** [March 24, 2026, 4:32pm UTC](https://discourse.paraview.org/t/volume-rendering-on-log-scale-switches-to-grayscale-map/17491 "2026-03-24T16:32:20Z")
**Posts on this page:** 6
**Page:** 1

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### Author: ![eisenlohr](https://discourse.paraview.org/user_avatar/discourse.paraview.org/eisenlohr/32/4703_2.png) [@eisenlohr](https://discourse.paraview.org/u/eisenlohr)
#### Post date: [March 24, 2026, 4:32pm UTC](https://discourse.paraview.org/t/volume-rendering-on-log-scale-switches-to-grayscale-map/17491/1 "2026-03-24T16:32:20Z")

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PV 6.1 RC1 inadvertently switches the colormap to grayscale (x-ray) when enabling logarithmic scaling. I use the attached example, switch to volume rendering, set the data limits to 0.2–5, then toggle between linear and logarithmic mapping. The result is shown in the two screen shots…

 ![image](https://discourse.paraview.org/uploads/default/original/3X/4/8/48b0917407469e0679291556ca295b49af8b65ec.jpeg)

 ![image](https://discourse.paraview.org/uploads/default/original/3X/1/a/1a438eb39d128389e63e17a69974592dce7dffbd.jpeg)

[ODF.vti](https://discourse.paraview.org/uploads/short-url/9ZB9KdnIDDUBpAjeLA6qEJyGJSK.vti) (331.7 KB)

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### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [March 24, 2026, 4:53pm UTC](https://discourse.paraview.org/t/volume-rendering-on-log-scale-switches-to-grayscale-map/17491/2 "2026-03-24T16:53:03Z")

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Confirmed, please open an issue on [https://gitlab.kitware.com/paraview/paraview/-/work\_items?sort=created\_date&state=opened&first\_page\_size=100](https://gitlab.kitware.com/paraview/paraview/-/work_items?sort=created_date&state=opened&first_page_size=100)

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### Author: ![cory.quammen](https://discourse.paraview.org/user_avatar/discourse.paraview.org/cory.quammen/32/11193_2.png) [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)
#### Post date: [March 24, 2026, 4:59pm UTC](https://discourse.paraview.org/t/volume-rendering-on-log-scale-switches-to-grayscale-map/17491/3 "2026-03-24T16:59:11Z")

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See this in 5.10.1 FYI.

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### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [March 24, 2026, 5:01pm UTC](https://discourse.paraview.org/t/volume-rendering-on-log-scale-switches-to-grayscale-map/17491/4 "2026-03-24T17:01:09Z")

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Indeed, old issue

[https://gitlab.kitware.com/paraview/paraview/-/work\_items/20250](https://gitlab.kitware.com/paraview/paraview/-/work_items/20250)

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### Author: ![eisenlohr](https://discourse.paraview.org/user_avatar/discourse.paraview.org/eisenlohr/32/4703_2.png) [@eisenlohr](https://discourse.paraview.org/u/eisenlohr)
#### Post date: [March 24, 2026, 6:42pm UTC](https://discourse.paraview.org/t/volume-rendering-on-log-scale-switches-to-grayscale-map/17491/5 "2026-03-24T18:42:56Z")

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Do you want me to open an issue or does the old one still awaits resolution?

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### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [March 25, 2026, 8:16am UTC](https://discourse.paraview.org/t/volume-rendering-on-log-scale-switches-to-grayscale-map/17491/6 "2026-03-25T08:16:07Z")

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The old ones still awaits resolution, but now we have a reproducer!