What
it does
Creates
a new image containing a random multi colour nebulous effect. Think
of it like the clouds filter on steroids (but somewhat slower).
Getting
Started
Run the script
from Photoshop's File/Scripts menu. You
can also set up a keyboard shortcut for the script through the
Edit/Keyboard
Shortcuts... menu..
Options
Image
Size
This is the size of the output image - you can change the width
and height seperately for odd sized images. You can enter basically
any size you want, but if Photoshop deems the value invalid it will
open up a real New Image window when you try to run the script.
Get
From Selected Image
Copies the size values from whichever image was active when the
script was envoked. If no image was active this does nothing.
Cycles
A slider with a valid range of 1 to 100. This is the number of itterations
the effect will run. Fewer is faster, but more gives a denser and
muddier image. The larger the image the higher this will need to
be to get a similar result.
Plasma
Type
Chooses the technique used for creating the effect. For more information
on this see below.
Contrast
Adjusts the contrast of the plasma - 0 will give the standard result,
100 will give a posterised style result.
Randomise
Cycles
This generates a random number of cycles for each colour channel,
up to the maximum set using the cycles slider. Generally it doesn't
make a lot of difference to the result, but it can produce some
interesting ones on occassion.
Greyscale
Result
Converts the resulting plasma to a greyscale image upon completion.
Plasma
Types
There are nine plasma types, each of which has a slightly different
looking result
For
examples of each type, click here.
Cloud
Gives a multi-colour Difference Clouds effect
Gradient
Gives a similar effect to cloud, but less dense and twisty
Radial
Again similar to cloud, but this has definate circular tendancys
Angle
A sort of Multicolour Cubist Cloud
Line
Somewhere between Angle and Gradient
Bubble
Multicoloured bubbles! The larger the Cycles are set the smaller
the bubbles appear
Spin
Similar to Radial, but focused around the image center (looks a
little like pond ripples at times)
Twist
Much like Gradient, but focused around the image center.
How
it works (plasma types)
This is actually very simple, and most PS users have actually done
something similar to the Cloud type at some point.
Cloud
runs the difference cloud filter on each colour channel seperately
for the requested number of cycles. It also randomly equalises or
auto contrasts the image to throw in a bit of extra randomness.
The
other effects all use the gradient fill tool to some extent, randomly
applying the fill to varying co-ordinates on each colour channel
using the difference blending mode. The more controlled effects,
such as bubble or diamond, use the same system, but with some of
the random variables being within set limits.
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