User guide

CHAPTER 13. FILTERS 147
13.113 Plasma
Overview
The Plasma Renderer plugin is a natural cloud generator. The results of a plasma
render, can be both pleasing, and useful for all digital artists. The cloud is rendered
using two configurable settings. Plasma Cloud Options
Plasma Cloud Settings
Random Seed Random Seed gives control over the apparent randomness of the cloud.
If the Time button is clicked, the random seed is generated using the system time
as the base for the randomization algorithm. This method yields particularly good
results, and is the preferred way of generating random clouds. The Number Entry
box can be utilized to reapply a particular random seed to the cloud.
Turbulence Turbulence allows control over the aggressiveness of the cloud. A lower
setting renders a softer, more pastel like cloud, where as a higher Turbulence
setting ensures a more detailed, and aggressive cloud structure.
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Clicking OK, will render the cloud destructively into the current layer. This
will erase the layer data.
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The cloud is computed as a square, thus rendering a plasma cloud onto a
non-square layer will stretch the cloud.
13.114 PNG
Overview
Allows you to configure settings for saving a PNG file. All applications which can
handle PNG files should be able to read any PNG saved from GIMP. However you can
make decisions here about which information about your image should be preserved in
the file, and how hard GIMP should try to keep the file size small. PNG File Options
PNG File Settings
Interlacing (Adam7) The Adam7 interlacing option stores image data in an order
which allows browsers or viewers to show progressively more detail as they load
the file, at the cost of increased file size.
Save background color This adds a bKGD chunk to your PNG file which advises
viewer software to choose a background color like your currently selected GIMP
background color. Adding this chunk increases file size slightly. Netscape NAV-
IGATOR will not display a png transparently if the file has been saved with this
option. It will instead use the chosen background color behind the image.