User Guide

CHAPTER 13. FILTERS 114
Fade direction Fade dirdescribes the direction from which the spokes will fade. The
actual fading is set in the Brush Options.
• In renders the spokes from the outside inwards.
• Out renders the spokes from the inside outwards.
Spokes The Spokes setting changes the number of spokes that will be used in the
render.
Inside Pixels The Inside Pixels setting controls the distance from the center of the
image from which the spokes will begin rendering.
Outside Pixels The Outside Pixels setting controls how far the spokes will radiate.
Start angle Start Angle controls the angle at which the first spoke will be rendered.
Arc angle Arc Angle sets the overall maximum number of degrees that the spokes will
traverse. A setting of 180 here would render the spokes along half of the total
degrees available in a circle.
13.24 BZ2
Overview
THE GIMP is capable of loading and saving images which have been bzip2 com-
pressed. In order to save a bzipped file, either Save By Extension or the bz2 extension
can be used. The file must be named in a similar format to: filename.extension.bz2
whereextension is the extension of a supported file format. Saving a bzipped TIFF
If the file is named foo, the filename could be entered as either foo.tif.bz2 or
foo.tiff.bz2. BZ2 : Further Information
For this plug-in to work, the BZIP2 application is required. To check if this application
is present, type bzip2 -version in a terminal window. If there is output similar to:
bzip: command not found then BZIP2is not installed and this plug-in cannot be
used..




BZIP2 is available from Cygnus Sourceware.
13.25 Stretch Contrast
Overview
This tool automatically stretches the contrast for all three channels. For each chan-
nel in the image, the tool finds the maximum and minimum values and stretches the
histogram to the full contrast range. See also
Further histogram information can be found on the Histogram help page.
A more intelligent version of this filter is the Autostretch HSV filter.