User Guide

CHAPTER 17. GLOSSARY 192
Value
The image on the left illustrates a normal layer mode and the image on the
right shows the same two layers in value mode.
N
Noise Noise refers to image noise. This is most commonly, a visual representation
of audial white noise. A common place that noise is found in visual format is
television sets that are not receiving signal. It is considered to be a random
collection of pixels of certain colors.
P
Parasite A piece of information which is included in a file such as the compression type
or a comment.
Perl A scripting language which can be used for GIMP plug-ins.
Plug-In Extensions to the standard GIMP feature set.
S
Sample Merge Sample Merging refers to the system of taking sampling information
from the sub-pixel layer of the image. Normally all pixel changes are based on a
lowest resolution of one pixel. Sub-pixel operations take the information from a
layer that has no lowest resolution. It is a mathematical level that uses vectors to
describe the operations.
Script-Fu A scripting language designed specifically for GIMP.
Stroke A function for making a selection, path or channel into a solid line using the
paintbrush.
Swap Directory An area on your hard disk which effectively extends the amount of
main memory available to GIMP meaning larger images or more complex opera-
tions can be performed.
T
Tile Cache A way that GIMP speeds up image display by keeping the data in memory.
Tool A mode for manipulating image functions.Paintbrush andClone are examples of
tools.