imager_denoiser_oidn

Class

Driver

Synopsis

 

^{_{Left: without denoising. Right: using imager_denoiser_oidn.}}

 

The Oidn denoiser (based on Intel's Open Image Denoise technology) is available as a post-processing effect. It is integrated into Arnold for use with IPR as an imager (so that you get a very quickly denoised image as you're moving the camera and making other adjustments). 

• Arnold will automatically force a box_filter on outputs with filters with known issues when either of the denoisers are used. This is because the Oidn denoiser does not perform well with filters that span across multiple pixels.
• Denoisers won't work as well after imagers have been applied to them. Therefore denoisers should be applied before any other post-processing imagers (top of imagers list).
• The Oidn denoiser only works on full frames rather than buckets.

input

enable

layer_selection

Selects layers processed by this imager with a glob or operator expression. An imager can use a selection to determine what nodes will be selected to be processed by the imager at render time. The selection is an expression that can consist of multiple selections concatenated by: 

• or (union)
• and (intersection)
• not (negation)
• and not (exclusion)
• () for nested scoping

Each selection uses glob patterns and regular expressions and a node will be processed by the imager if the expression matches the node name. By default, glob matching is used unless the selection is in a regex quote, i.e. r'<my_regex>'. For example:

specular or diffuse
 
not r'sss_(direct|indirect)'
 
r'color_(mask1|mask2)' or r'mask[34]'

output_suffix

albedo

Optional albedo feature AOV is used to improve denoising quality (denoise_albedo_noisy is the default). Setting to an empty string "" will disable the use of feature AOVs, which might give better results when denoising AOVs for which no albedo exists.

denoise_albedo_noisy (default)	Without denoise_albedo_noisy