NAME

       img-dted - Img, DTED Format (dted)

SYNOPSIS

       package require Tk

       package require img::dted  ?1.4?

       image create photo ?name? ?options?

_________________________________________________________________________________________________

DESCRIPTION

       The  package img::dted is a sub-package of Img. It can be loaded as a part of the complete
       Img support, via package require Img, or on its own, via package require img::dted.

       Like all packages of Img it does not provide new commands, but  extends  the  existing  Tk
       command  image  so  that  it  supports  files  containing raster images in the DTED Format
       (dted). More specifically img::dted extends Tk's photo image type.

       The name of the new  format  handler  is  dted.   This  handler  provides  new  additional
       configuration options. See section DTED OPTIONS for more detailed explanations.

       All of the above means that in a call like

       image create photo ?name? ?options?

       [1]    Image data in dted format (options -data and -file) is detected automatically.

       [2]    The  format  name  dted is recognized by the option -format.  In addition the value
              for the option is treated as list and may contain any of the special options listed
              in section DTED OPTIONS.

NOTE

       This format handler must be loaded explicitly with package require img::dted.

SUPPORTED DTED TYPES

               Interpret DTED terrain elevation data as a grayscale image.

               List of currently supported features:

               Type   |     Read      |     Write     |
                      | -file | -data | -file | -data |
               ----------------------------------------
               Gray   | Yes   | Yes   | No    | No   |

DTED OPTIONS

       The handler provides the following options:

       -verbose bool
              If set to true, additional information about the loaded image is printed to stdout.
              Default is false.

       -nchan int
              Specify the number of channels of the generated image.  Default is 1, i.e. generate
              a grayscale image.

       -gamma float
              Specify a gamma correction to be applied when mapping the input data to 8-bit image
              values.  Default is 1.0.

       -nomap bool
              If set to true, no mapping of input values is  done.   Use  this  option,  if  your
              elevation file contains values in the range of 0 .. 255 only.  Default is false.

       -min short
              Specify  the  minimum  pixel  value  to be used for mapping the input data to 8-bit
              image values.  Default is the minimum value found in the elevation data.

       -max short
              This option is supported for reading only.

              Specify the maximum pixel value to be used for mapping  the  input  data  to  8-bit
              image values.  Default is the maximum value found in the elevation data.

SEE ALSO

       img-bmp,  img-dted,  img-gif,  img-ico, img-intro, img-jpeg, img-pcx, img-pixmap, img-png,
       img-ppm, img-ps, img-raw, img-sgi, img-sun, img-tga, img-tiff, img-window,  img-xbm,  img-
       xpm

KEYWORDS

       dted, image handling, tk

COPYRIGHT

       Copyright (c) 1995-2009 Jan Nijtmans <nijtmans@users.sourceforge.net>