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title: "Denoiser"
canonical: "https://documentation.chaos.com/space/VREVIT/160432993/Denoiser"
format: markdown
---
This page provides information on the Denoiser rollout. Overview The V-Ray Denoiser takes an existing render and applies a denoising operation to it after the image is completely rendered out via normal means. The denoising operation detects areas where noise is present and smooths them out. The V-Ray Denoiser operates on other render elements rather than being part of the rendering process itself, therefore the denoising operation does not require re-rendering of the project. The Denoiser settings can be quickly changed and tested over and over to improve the result. Currently, the project can contain only one  Denoiser  preset. Future versions of V-Ray will support simultaneously multiple  Denoiser  channels with different settings. Original Denoised Parameters Denoiser  – Activates V-Ray Denoiser channel. Engine  – Allows choosing between the  Default V-Ray Denoiser ,  NVidia Al Denoiser , or  Intel Open Image Denoise . Each offers a different denoising algorithm that comes with different benefits. Default V-Ray denoiser  - V-Ray's denoising algorithm. It can utilize the CPU or the GPU (AMD or NVIDIA GPUs) to perform the denoising. It is consistent when denoising render elements, as it applies the same denoising operator to all render channels. This means that it is recommended for denoising the render elements to be used for compositing back the beauty image. NVIDIA AI denoiser  -  V-Ray's integration of NVIDIA's  AI-based denoising algorithm. The NVIDIA AI denoiser  requires an NVIDIA GPU  to work, regardless of whether the actual rendering was performed on the CPU or GPU. This means that rendering on the CPU still requires an NVIDIA GPU for denoising with the NVIDIA AI denoiser and has some advantages and drawbacks compared to the Default V-Ray Denoiser. For example, the  NVIDIA  AI denoiser performs the denoising faster, but is not consistent when denoising render elements. This means that there are differences between the original RGB image and the one reconstructed from render elements that are denoised with the  NVIDIA  AI denoiser. The Nvidia AI denoiser only works on Nvidia Maxwell and newer GPU architectures. Intel Open Image Denoise  – V-Ray's integration of  Intel Open Image Denoise . By default, the denoiser runs on an NVIDIA GPU. If no compatible NVIDIA GPU is available, it automatically falls back to the CPU. Mode  – Specifies how the results of the Denoiser are saved. Only generate render elements  – All render elements required for denoising are generated, but a denoised version of the image is not computed, and the VRayDenoiser render element is not present.  Hide denoiser result channel  – The VRayDenoiser channel is not present separately in the VFB. The effectsResult channel is generated with the denoised image. Show denoiser result channel  – The VRayDenoiser and effectsResult channels are generated. Preset  – When using the  Default V-Ray denoiser , the presets can be used to automatically set the  Strength  and  Radius  values. Default   (Strength=1, Radius=10)  – Applies a mid-level denoising. Mild   (Strength=0.5, Radius=5)  – Applies a more subtle level of denoising than the  Default  preset. Strong   (Strength=2, Radius=15)  – Applies a stronger level of denoising than the  Default  preset. Custom  – Allows the  Strength  and  Radius  parameters to be set to custom values. Strength  – Determines how strong the denoising operation is. This parameter is available only when  Preset  is set to  Custom . Radius  – Specifies the area around each pixel to be denoised. A smaller radius affects a smaller range of pixels while a larger radius affects a larger range, which increases the noise removal. Update  – Reapply the denoising operation when the required render elements are already present in the V-Ray frame buffer. Use this button to apply denoising again after settings in this rollout have been changed.