Game Development Reference
In-Depth Information
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The Noise & Grain effects all deal with noise in some form or
another. Some effects add noise, while others remove it. A cou-
ple of these effects—Fractal Noise and Turbulent Noise—are in a
class all on their own, as they create grayscale patterns. Let's look
at a few important concepts to help you get the most out of this
chapter, and to obtain an overview of what is coming up.
Good Noise
In the video world, noise gets a bad rap. But, noise isn't always
a bad thing. Often, adding noise is desirable because it creates a
sense of grit and realism. Photographs and computer-generated
images are notorious for looking too clean and polished. Adding
noise can help them look more fi lm-like. When gradients appear
to have banding (posterization), noise can be added to smooth
the transitions between colors. Some effects (such as Match
Grain) are here to help you create a consistent amount of noise
between composited elements. It's one of the great ironies in the
visual effects world, but adding dirt or grain can sometimes be
what makes your fi nal results so authentic.
Noise vs. Grain
There are many effects in this category—11, to be exact. Except
for the two that generate patterns, they all either remove or add
noise. So, it can be said that not all Noise & Grain effects are cre-
ated equal. Thankfully, there is a secret way to identify the best
effects here. The key is the word “grain”. Effects in this category
that have the word grain in their title (e.g., Add Grain, Match
Grain, and Remove Grain) are all cut from the same high quality
mold. They are more complex, but sometimes even the default
results are all you need. If you're looking for quick, simple, and
easy effects in this genre, go for the other effects.
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