Category Archives: Animation

Nuke VHS Noise Group

mograph in Nuke?!

vhs063

I’ve recently had to create (and re-use) a customizable VHS tracking-error style effect in Nuke, and have collected the node group in the attached file. It’s mostly controlled by some nobs on the “MASTER” node, though there are some other tweakable elements here. Unfortunately there’s no documentation so you’ll have to play around with it, but I’ve been getting good results from it.

Download:

vhsNoise
tested on Nuke 8.0v1

Luminance Curves

being an exploration on converting values from one set to another using curves
grayscale_curve-perceptual

Often in compositing, I will need to take one set of values and convert it to a different set of values. Say I have a linear image, with luminance values in a range from 0 – 4.589:

Input: Output:
0 0
4.589 1
If I want to do some fancy operation on that image based on it’s luminance, I’ll probably want to convert that range to 0-1, so it’s easier to work with. The easiest and most straight-forward type of conversion is a linear one, of course, where we simply divide all the luminance values by the largest value, giving us a range of values between 0 and 1:

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