# plot over a line color

**URL:** https://discourse.paraview.org/t/plot-over-a-line-color/7114
**Category:** ParaView Support
**Created:** [April 30, 2021, 3:11pm UTC](https://discourse.paraview.org/t/plot-over-a-line-color/7114 "2021-04-30T15:11:11Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![han\_chen](https://discourse.paraview.org/user_avatar/discourse.paraview.org/han_chen/32/6549_2.png) [@han\_chen](https://discourse.paraview.org/u/han_chen)
#### Post date: [April 30, 2021, 3:11pm UTC](https://discourse.paraview.org/t/plot-over-a-line-color/7114/1 "2021-04-30T15:11:11Z")

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![屏幕截图 2021-04-30 225901](https://discourse.paraview.org/uploads/default/original/2X/b/b370e1806fd3256920e710bcb2291f5b2fd1dd65.png)  
I’m a begginer of paraview. i encountered some issues about “plot over a line” when learning openFoam. it seemed that the color of the curves looked much lighter than i thought. i set the colour to black but it looked like grey.  
is it a problem of the software or is there any way to correct it.  
Thanks.

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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: [May 3, 2021, 7:22am UTC](https://discourse.paraview.org/t/plot-over-a-line-color/7114/2 "2021-05-03T07:22:25Z")

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Looks like a graphical issue, can you try another GPU ?