SeGrain node

This documentation is for version 1.0 of SeGrain.

Description

Adds synthetic grain.

Push “presets” to get predefined types of grain, these are the correct size for 2K scans.

You can also adjust the sliders to match a sample piece of grain. Find a sample with a rather constant background, blur it to remove the grain, and use as input to this. View with a wipe in the viewer so you can make a match. It helps to view and match each of the red, green, blue separately.

See also http://opticalenquiry.com/nuke/index.php?title=Integration#Matching_grain

Inputs

Input Description Optional
Source   No
Mask   Yes

Controls

Parameter / script name Type Default Function
Seed / grainSeed Double 134 Change this value to make different instances of this operator produce different noise.
Static Seed / staticSeed Boolean Off When enabled, the seed is not combined with the frame number, and thus the effect is the same for all frames for a given seed number.
Presets / grainPresets Choice Kodak 5248 Presets for common types of film.
All / grainSizeAll Double 1 Global factor on grain size. Useful if working with scans which are not 2K (the preset sizes are computed for 2K scans).
Red / grainSizeRed Double 3.3 Red grain size (in pixels).
Green / grainSizeGreen Double 2.9 Green grain size (in pixels).
Blue / grainSizeBlue Double 2.5 Blue grain size (in pixels).
Red / grainIrregularityRed Double 0.6 Red grain irregularity.
Green / grainIrregularityGreen Double 0.6 Green grain irregularity.
Blue / grainIrregularityBlue Double 0.6 Blue grain irregularity.
Red / grainIntensityRed Double 0.42 Amount of red grain to add to a white pixel.
Green / grainIntensityGreen Double 0.46 Amount of green grain to add to a white pixel.
Blue / grainIntensityBlue Double 0.85 Amount of blue grain to add to a white pixel.
Correlation / colorCorr Double 0 This parameter specifies the apparent colorfulness of the grain. The value represents how closely the grain in each channel overlaps. This means that negative color correlation values decrease the amount of overlap, which increases the apparent color of the grain, while positive values decrease its colorfulness.
Black / grainBlack Color r: 0 g: 0 b: 0 Amount of grain to add everywhere.
Minimum / grainMinimum Color r: 0 g: 0 b: 0 Minimum black level.
Invert Mask / maskInvert Boolean Off When checked, the effect is fully applied where the mask is 0.
Mix / mix Double 1 Mix factor between the original and the transformed image.