DVO Grain GT

DVO Grain GT is a fast grain management tool based on DVO Grain that makes full use of modern advanced CPU instruction sets.

The Digital Vision DVO Grain algorithm is specifically designed to manage film grain look and reduce unwanted electronic noise in film or video originated material. Uses include :

  • Restoration
  • Compression pre-processing
  • Image processing of newly shot material

The DVO Grain GT algorithm incorporates the Digital Vision Emmy award-winning PHAME advanced motion estimation technology along with edge-preserving 3-D Spatio-temporal filters and temporal (recursive) filters to allow artists to produce clean, sharp pictures and to match the look of film grain from shot-to-shot (including grain matching for underexposed film). The process of adaptively selecting the best mix of spatial and recursive filtering for each pixel is unique to the DVO Grain algorithm.

Amount defines the mix between the result and the input, with a percentage slider. The Parameter dropdown will let you choose between Basic and Advanced modes, with Basic offering a Mode dropdown that includes presets for Film and Video footage along with a Strenght slider. The “Follow Basic” Checkbox keeps all settings sliders connected to your preset and strength choice. 

Advanced Mode disables Basics Settings and lets you decide all settings manually. If you want to manually set the parameters, we recommend choosing a Basic preset first and then changing to Advanced mode to adjust settings manually.

The Temporal Strenght is the most effective filter in terms of reducing grain and noise, with separate sliders for each channel. The Global checkbox enables the filtering of the whole image instead of an adaptive solution with edge detection, so use it only in extreme situations because it can create motion smearing artifacts.

The Spatial Filtering section complements the Temporal settings by processing grain and noise in portions of the image that have motion, while Spatial Size adjusts the size of the grain and noise in the pixels. The Spatial Threshold determines when to filter, depending on the intensity of the pixels. A low setting will only affect low-intensity pixels, like flat areas, with a high setting affecting high-intensity pixels (edges).

The Misc section includes more Spatial Filter settings. Here you can further refine the results with the Spatio-Temporal option using temporal taps. Temporal Mix controls the balance between the spatial and temporal taps. 

You can also define your motion-estimation settings to avoid creating motion artifacts when using higher settings and, if it’s a video file, to process YUV and interlaced signals.

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