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Enabled – Enables the render elements to appear in the V-Ray Virtual Frame Buffer.

Deep output – Specifies whether to include this render element in deep images.

Filename suffix – The text added to the end of the rendered file, when saved as a separate file (e.g. myrender.denoiser.vrimg).

Mode – Specifies how the results of VRayDenoiser will be saved.

Only generate render elements – All render elements required for denoising are generated so that denoising can be done with the Standalone Denoise Tool or the V-Ray Denoiser plugin for Nuke. The information calculated within them is not applied to other render elements, and no VRayDenoiser Render Element is generated.
Hide denoiser element – The VRayDenoiser channel is not present separately in the VFB. The effectsResult channel is generated with the denoised image.
Show denoiser element – The VRayDenoiser Render Element is generated to contain a denoised version of the RGB Color Render Element using the specified settings. The original render elements, including the RGB Color Render Element, are not changed.

Engine – Allows choosing the production denoise engine. Available options are:

Default V-Ray denoiser;
NVIDIA AI denoiser; Note that, the NVIDIA AI denoiser requires an NVIDIA GPU.
Intel Open Image denoiser.

IPR Engine – Allows choosing the denoise engine during IPR. Available options:

Default V-Ray denoiser;
NVIDIA AI denoiser; Note that, the NVIDIA AI denoiser requires an NVIDIA GPU.
Intel Open Image denoiser.

Preset – Offers presets to automatically set Strength and Radius values. Available only for the Default V-Ray Denoiser.

Default – Applies mid-level denoising.
Mild – Applies a more subtle level of denoising than the Default preset.
Strong – 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 the strength of the denoising operation. This value is automatically set by preset selection, but can be changed 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. This value is automatically set by preset selection, but can be changed when Preset is set to Custom.

Temporal Mode – This option is only available when the Engine is set to NVIDIA AI denoiser. When enabled, the Denoiser uses information from previous frames to create a smoother transition. Useful for rendering animation.

NVIDIA AI upscale – When enabled, the rendered image is internally calculated with half the resolution set in the render setup (in each dimension), and the denoised image is upscaled to the full resolution using NVIDIA's AI upscaling technology. NVIDIA's AI upscaling technology represents an advanced method based on machine learning which provides better and more detailed results when compared to a standard image interpolation. For example, a 3840x2160 resolution renders the image internally in 1920x1080 and the AI upscaling denoiser produces the final 3840x2160 image from the lower resolution render.

Hardware acceleration – Uses the GPU device(s) to accelerate the denoising calculations. In case there is no compatible GPU device, denoising will automatically fall back to use the CPU, even if the option is enabled. This option is only available for the Default V-Ray Denoiser. 

Denoise alpha – Controls whether the alpha is also denoised or not.

Update – Re-apply the denoising operation when the required render elements are already present in the V-Ray frame buffer. The elements can be either generated from a render in Maya, or by loading a multi-channel .vrimg or OpenEXR into the V-Ray Frame Buffer. Use this button to apply denoising again after settings on this rollout have been changed.