The Arnold Denoiser is a stand-alone program post-process denoiser executable. It works on EXR files with multiple layers (merged) and outputs an EXR file with the denoised layers. It takes into account multiple frames and multiple light AOVs. Like most denoisers, it considers a neighborhood around the current pixel and looks for similar neighborhoods inside a given search area to blend together. To use the Arnold Denoiser, you will need to render images via the Arnold EXR driver.
The Output Variance AOV toggle on the Arnold ROP needs to be selected to generate the AOVs that the denoiser requires.
Arnold Denoiser ROP (left). Output Variance AOV toggle in Arnold ROP (right).
The path to the image or image sequence to be denoised.
Set the denoised output file path. The output file will include the denoised layers with the same names as the original layers. For each file, a new one is saved, postfixed by '_denoised' (the denoised images).
Note that the file output size differs from the input files because only the main RGBA layers are saved (without the auxiliary AOVs).
noiceis in removing noise can be controlled by setting a variance threshold with the command line argument
-v). The default value is 0.5, higher values will make the denoising more aggressive by considering similar neighborhoods that have bigger color disparities.
Pixel Search Radius
noicewill search a square area with a radius set with the command line argument
-sr). The bigger this area the bigger the denoising stability and the higher the chance that similar neighborhoods to be considered will be found. The default value is 9, which gives a 19x19 square neighborhood. Setting it to 21 (a search window of 42 x 42) will look over a pixel area equivalent to loading 5 frames.
Pixel Patch Radius
This increases the softness of the denoising (while always preserving the features). The default is 3 (on the big side), but a low value would be maybe 0 or 1, middle 3 and high 5.
For every pixel
noice will consider its neighborhood patch and look for other pixels with similar neighborhood patches. The radius of this neighborhood can be controlled with the
-pr) command line argument. The default value is set to 3, which gives a 7x7 square neighborhood.
The number of extra images to be used for temporal stability. Multiple additional frames can be specified to increase temporal stability (for instance
render001.exr, render002.exr, render003.exr).
Light Group AOVs
Additional light AOVs to be co-denoised can be specified.
Define the number of threads to be used. The default is to leave one thread free, so it should not 'freeze' your computer while denoising.