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The -F and -L options ask the denoiser to use the first and last of the given images, respectively, when doing cross-frame filtering but not to actually denoise those images themselves. Thus using -F and -L with frames 2, 3, and 4 will filter and write frame 3 only, though it will use frames 2 and 4 to do so. The first and last executions of denoise here are the exceptions in that they are set to filter two frames at a time. In any event, when run this way the denoiser will always be working one frame behind the rendering.

Layered Filtering

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For AOVs

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In some cases, you may wish to denoise individual passes/AOVs, such as the diffuse contribution for a particular light group. Rather than duplicate the geometry channels into the images for each pass, it is possible to write them out once per frame and then combine them with the individual pass images. In order for this to work some fairly strict naming requirements must be met. The below names are required so that the denoise tool knows what the channel contains, it does not determine the contents by looking at them. This is why the naming convention must be followed:

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