| # GRASS Help System

i.composite -

i.composite is an imagery function that creates a color composite image from three band files specified by the user. The user specifies the bands to be used by assigning the bands a red, blue or green intensity. The resulting image is a single raster file composed of the three bands that were selected. The color composite can be displayed, plotted or manipulated as would any raster file in GRASS.

This program can be used to create a false color composite. A false color composite is the color asssignment that is used in infrared photography. The green band is assigned shades of the primary color blue, the red band is assigned shades of the primary color green and the near infrared band is assigned shades of the primary color red.

A good use for the color composite is in the program i.points, which allows the user to locate points on an image to be rectified. When using i.points, if an image is not classified before it is rectified, the only imagery files available on which to locate and mark points may be single band files. These are displayed in grey scale color scheme only. When color may enhance the ability to locate points on a image to be rectified, a color composite image can be displayed and marked to provide this advantage.

Manual entry for i.composite

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Automatically created on: Thu Oct 19 08:17:15 2006