# Surface LIC Darkness

**URL:** https://discourse.paraview.org/t/surface-lic-darkness/11241
**Category:** ParaView Support
**Created:** [January 24, 2023, 1:05am UTC](https://discourse.paraview.org/t/surface-lic-darkness/11241 "2023-01-24T01:05:06Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Neurospasm](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/n/e99b99/32.png) [@Neurospasm](https://discourse.paraview.org/u/Neurospasm)
#### Post date: [January 24, 2023, 1:05am UTC](https://discourse.paraview.org/t/surface-lic-darkness/11241/1 "2023-01-24T01:05:06Z")

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Hello,

I’m having an issue with Surface LIC darkness when using pvpython (version 5.9.1).

I’ve been using pvpython to automate two CFD cut-plane screenshots. I apply the same legend colorbar limits and discretization to each cut-plane, and the surface contours have the same colors, though there are some small spatial differences due to differing flowfields at each station. However, when I apply Surface LIC in my pvpython script, one screenshot appears noticeably darker. This darkness is noticable in all color bands.

Even when I use a very verbose trace to get the operations scripted (in case defaults somehow change), one screenshot still appears darker. Since the surface contours are very similar to one another, I imagine this must be due to streamline density? Is there a specific control for this? Any thoughts on why this might be the case?

When I approach this process manually in Paraview (5.9.1), I don’t see the same discrepancy.

I’m not modifying any Surface LIC parameters except for setting Color Mode = “Multiply” and Enhance Contrast = “LIC and Color”.

Thanks!