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Pick Changes out a few pixels with
neighbouring ones.
Spread This filter works by swapping a pixel
in one location with a randomly
selected pixel from another source
while taking colour transitions into
account.
CIE lch Noise filter According to CIE standards, the
CIE lch Noise filter generates noise
in the active layer or selection by
using the Lightness, Chroma, Hue
colour model.
RGB Noise Filter The RGB Noise filter adds a
normally distributed noise to a
layer or a selection. It uses the RGB
colour model to produce the noise
(noise is added to red, green and
blue values of each pixel). A normal
distribution means that only minor
noise is added to the majority of
pixels in the affected area, while
more extreme values affect fewer
pixels.
Edge Detection Filters
Edge detect filters look for lines separating various colours so they can identify an object’s features. They are employed
in many creative activities. Before applying edge filters, some blurring is frequently required because it flattens tiny
signal ripples and prevents false edges.
Multimedia Design—GIMP 251

