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Enable – Turns the Denoiser on or off. When enabled, it automatically adds the Denoiser as a Render Element.

Engine – Allows choosing between the V-Ray Denoiser, NVIDIA AI Denoiser and Intel Open Image Denoise.

Preset – Offers presets to automatically set the strength and radius values.   For more information, see the Denoising Presets example below.

Mild – Applies a more subtle level of denoising than the Default preset. 
Default – Applies a mid-level denoising. 
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 how strong the denoising operation is.

Radius – Specifies the area around each pixel to be denoised. A smaller radius affects a smaller range of pixels. A larger radius affects a larger range, which increases the noise removal.

Mode – Specifies how the results of the Denoiser are saved and presented in the VFB.

Only Render Elements – All render elements required for denoising are generated but a denoised version of the image is not computed. VRayDenoiser and effectsResult render channels are not generated. Use this option if you plan to denoise a sequence of images using the standalone denoising tool and do not want to spend time on denoising during the actual rendering process.
Hide Denoiser Channel – The VRayDenoiser channel is not present separately in the VFB. The effectsResult channel is generated with the denoised image.
Show Denoiser Channel – The VRayDenoiser and effectsResult channels are generated.

Update button – Press to regenerate the denoiser channel without having to re-render the scene.

Engine – Allows choosing between the V-Ray Denoiser, NVIDIA AI Denoiser and Intel Open Image Denoise.

Upscale – When enabled, the image is rendered at half size to speed up its calculation while its denoised output is upscaled to full resolution. This results in cleaner and faster initial updates ideal for interactive rendering. NVIDIA's AI upscaling technology represents an advanced method based on machine learning that provides better results compared to standard image interpolation. Note that render elements without the 'Denoise' option enabled are upscaled using standard interpolation.