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You can generate noise with whichever shape, size and frequency distribution you need. It's entirely possible to emulate film grain computationally.

one example: A. Newsom: Realistic Film Grain Rendering https://pdfs.semanticscholar.org/b791/566b0a38cc0269b1b7f9ad...

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That's why I said digital noise. If you're using randomness to generate something that emulates film grain then by definition it's not noise, it's a procedurally generated texture.

The point was that many editing tools offer noise generation that works at a pixel level. The author was explaining why those are unsuitable for the task. That doesn't make it nonsense.

Are noise and procedurally generated textures mutually exclusive?

The Wikipedia article for gradient noise[1] says:

> Gradient noise is a type of noise commonly used as a > procedural texture primitive in computer graphics.

[1]: https://en.wikipedia.org/wiki/Gradient_noise

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