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img-dted(3tk) Img img-dted(3tk) 





NAME


img-dted - Img, Digital Terrain Elevation Data Format (dted)






SYNOPSIS


package require Tk 


package require img::dted ?1.4?


image create photo ?name?
  ?options?










DESCRIPTION


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 Digital Terrain Elevation
    Data 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



  

  





  
[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:



  

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

  

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

  

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

  

  
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.

  

  
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.

  

  
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-flir, 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) 1995-2023 Jan Nijtmans <nijtmans@users.sourceforge.net>








  

    1.4
    img-dted