Color composite

Dialog box

A color composite is created by combining 3 raster images or maps. One map is displayed in shades of red, one in shades of green and one in shades of blue.

Dialog box options for 24 Bit Color Composite:

24 bit:

Select this check box if you want to create a map that can be displayed in 24-bit graphic mode (domain Color). Clear this check box if you want to create a color composite which uses a Picture domain.

RGB:

Creates a 24-bit color composite with Red, Green and Blue bands as input. See Standard Color Composite options below.

HSI:

Creates a 24-bit color composite with Hue, Saturation and Intensity bands as input.

  

You should only select these 24-bit options, if your graphic board is configured to use more than 256 colors, for instance High Color 16-bit or True Color 24-bit (see Display Settings in Windows' Control Panel).

Dialog box options for Standard Color Composite:

Standard:

Select the Standard option button when you want to use the standard color composite representation which has six shades of red, six shades of green and six shades of blue (total 216 colors).

Linear Stretching:

Select Linear Stretching if you want to obtain intervals of equal length (in terms of input values) for the output colors.

Histogram equalization:

Select Histogram Equalization if you want to obtain an equal number of pixels for the different output colors.

Percentage:

Select this check box to define input intervals by a percentage of pixels to be ignored on both sides of the input map's histogram.
Clear this check box to specify input intervals by a minimum and maximum value of each input map.

Dialog box options for Dynamic (Heckbert) Color Composite:

Dynamic:

Select the Dynamic option button when you want an automatic division of input values over a number of output colors.

Colors:

Enter a value for the number of colors of which the dynamic color composite should consist (integer value between 2 and 255).

General dialog box options:

Red Band:

Select a raster map to be displayed in shades of red. Open the list box and select the appropriate raster map, or directly drag a raster map from the Catalog into this box.

Green Band:

Select a raster map to be displayed in shades of green.

Blue Band:

Select a raster map to be displayed in shades of blue.

Output raster map:

Type a map name for the output color composite.

Description:

Optionally, type a description for the output map. The description will appear in the status bar of the Main window when moving the mouse pointer over the map in a Catalog, and in the title bar of a map window when the output map is displayed. If no description is supplied, the output map will use its own definition as description.

When you click the Show button, the dependent output map will be defined, calculated and shown. When you click the Define button, the dependent output map will only be defined; if necessary the map will be calculated later, for instance when the map is opened to be displayed.

When the Dynamic option is used, the output map will use an internal Picture domain which has an internal representation.

Tip:

This operation creates a permanent color composite map. When your graphics board is configured to use more than 256 colors, for instance High Color 16-bit or True Color 24-bit (see Display Settings in Windows' Control Panel), you can also interactively display a color composite by selecting the Show MapList as Color Composite command from the Operations, Visualization menu. By creating an interactive color composite, you can easily change intervals, select other bands, etc. The resulting color composite is displayed in a map window. To store such a color composite, you can save the map window as a map view.

See also: