---
title: "Denoiser in Houdini"
canonical: "https://rmanwiki-25.pixar.com/space/RFH25/22642867/Denoiser%20in%20Houdini"
format: markdown
---
1. In the OUT context, insert a denoise node and connect your RenderMan ROP node to the denoise node.    
  


> Macro (inline-media-image)

  
  
2. Under Images In the RenderMan ROP, untick **as RGBA** and select **Denoise**  
  
> Macro (inline-media-image)

  
  
  


3.   Select the **denoise** node and set mode type, output location, Asymmetry, Flow and debug options, and once ready to render, press the Denoise button.  
  
> Macro (inline-media-image)

  
  
  
To render the frame(s), click Denoise and Houdini will then render the frame(s) and once all the frames have been rendered, the denoise process will begin.

  


> ℹ️ ### Gotcha
> ℹ️ 
> ℹ️ Whilst it might sound obvious, always make sure you add the $F4 to your filename, otherwise, the denoiser will fail, even if you are rendering a single frame.