### 14.6. Perlin Noise

#### 14.6.1. Overview

This filter generates a noise texture using the Perlin Noise algorithm. Results don't depend on the image you opened.

Filter applied with default options: Alpha=1.200 Scale=1.800 Z offset=-1.000 Iterations=3

#### 14.6.2. Activating the Filter

This filter is found in the main menu under Filters → Render → Noise → Perlin Noise….

#### 14.6.3. Options

图 17.354. “Perlin Noise” filter options

Presets, “Input Type”, Clipping, Blending Options, Preview, Merge filter, Split view

  | 注意
  These options are described in 第 2 节 “Common Features”.

Alpha

  Low values give sharper noise

  图 17.355. “Alpha ” option examples

  Alpha = 0.300

  Alpha = 3.600

Scale

  Scale of the noise function: works like a zoom.

Z offset

  Vary noise.

  图 17.356. “Z offset” option examples

  Z offset = -1000

  Z offset = 0.900

Iterations

  The number of noise octaves.

  Iterations = 7

14.5. Cell Noise |  | 14.7. Plasma

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