# VTK.wasm 'ghost pixel' in browser
**URL:** https://discourse.vtk.org/t/vtk-wasm-ghost-pixel-in-browser/16479
**Category:** vtk.wasm
**Tags:** vtkwasm
**Created:** [July 7, 2026, 12:48pm UTC](https://discourse.vtk.org/t/vtk-wasm-ghost-pixel-in-browser/16479 "2026-07-07T12:48:58Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@HST](https://discourse.vtk.org/u/HST)
#### Post date: [July 7, 2026, 12:48pm UTC](https://discourse.vtk.org/t/vtk-wasm-ghost-pixel-in-browser/16479/1 "2026-07-07T12:48:58Z")
Hi,
I started with VTK.wasm. My first goal was, display an empty blue screen. But the display contains white pixel from the bottom left to the top right corner.
In a second step, I added a cone. The diagonal white pixel disappeared. Then I removed the cone from the renderer. The diagonal pixel appeared again together with some pixel of the cone.
Any idea what happens here? Thank you for any help.
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### Author:  [@jaswantp](https://discourse.vtk.org/u/jaswantp)
#### Post date: [July 7, 2026, 1:54pm UTC](https://discourse.vtk.org/t/vtk-wasm-ghost-pixel-in-browser/16479/2 "2026-07-07T13:54:27Z")
Hi @HST
I’ve never seen anything like that before. What browser?
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### Author:  [@HST](https://discourse.vtk.org/u/HST)
#### Post date: [July 7, 2026, 2:03pm UTC](https://discourse.vtk.org/t/vtk-wasm-ghost-pixel-in-browser/16479/3 "2026-07-07T14:03:05Z")
Hi Jaswant,
Google Chrome, Version 149.0.7827.201 (Offizieller Build) (64-Bit)
Microsoft Edge, Version 150.0.4078.48 (Offizielles Build) (64-Bit)
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### Author:  [@HST](https://discourse.vtk.org/u/HST)
#### Post date: [July 8, 2026, 8:02am UTC](https://discourse.vtk.org/t/vtk-wasm-ghost-pixel-in-browser/16479/4 "2026-07-08T08:02:52Z")
Hi again, I tried the cone example from the VTK web page and removed the cone to display an empty window. I also got the white diagonal ‘ghost pixel’ in the browser.
I can start my application also in native mode, using my own VTK build. This works fine, without any ‘ghost pixel’.
May there something be wrong with my VTK.wasm build?
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### Author:  [@HST](https://discourse.vtk.org/u/HST)
#### Post date: [July 8, 2026, 12:01pm UTC](https://discourse.vtk.org/t/vtk-wasm-ghost-pixel-in-browser/16479/5 "2026-07-08T12:01:39Z")
The described behaviour seems to be related to NVIDIA graphics cards. I use NVIDIA Quadro P5000. On other machines with an Intel graphics adapter, the issue doesn’t appear.
A quick fix is as follows: deactivate “Use hardware acceleration when available” in the Chrome browser settings. Settings → System → Use hardware acceleration when available
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### Author:  [@jaswantp](https://discourse.vtk.org/u/jaswantp)
#### Post date: [July 10, 2026, 3:53pm UTC](https://discourse.vtk.org/t/vtk-wasm-ghost-pixel-in-browser/16479/6 "2026-07-10T15:53:26Z")
Okay, good to know that it’s a gpu issue and not a vtk.wasm build issue. Did you try updating nvidia drivers?
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### Author:  [@HST](https://discourse.vtk.org/u/HST)
#### Post date: [July 15, 2026, 6:10am UTC](https://discourse.vtk.org/t/vtk-wasm-ghost-pixel-in-browser/16479/7 "2026-07-15T06:10:08Z")
Jaswant, yes I use the current driver version.