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^{_{Left: without denoising. Right: with imager_denoiserenabled.}}

• The imager_denoiser_noice is recommended forsingle frame rendering. It does not support denoising an animation sequence and can result in undesired effects between frames. If you want to render an animation, then disable this imager, render the scene with an Arnold EXR driver (Output Arnold Denoiser AOVs enabled), and use the Arnold Denoiser (or Denoising tab in the Arnold render settings, if your plugin supports it).
• Denoisers won't work as well after imagers have been applied to them. Therefore denoisers should be applied before any other post-processing imagers.
• You may have to wait a moment before you can see the result of the Arnold Denoiser appear in the render view.
  

A tutorial that covers how to use the Arnold Denoiser can be found here.