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img-raw(n)                                                                                        img-raw(n)



____________________________________________________________________________________________________________

NAME
       img-raw - Img, Raw Data Format (raw)

SYNOPSIS
       package require Tk

       package require img::raw  ?1.4?

       image create photo ?name? ?options?

____________________________________________________________________________________________________________

DESCRIPTION
       The package img::raw 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::raw.

       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 Raw Data Format (raw). More specifically
       img::raw extends Tk's photo image type.

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

       All of the above means that in a call like

       image create photo ?name? ?options?


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

       [2]    The format name raw 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 RAW OPTIONS.


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

SUPPORTED RAW TYPES
        Grayscale image:  1 channel  of 32-bit floating point   values.
                          1 channel  of 16-bit unsigned integer values.
                          1 channel  of  8-bit unsigned integer values.
        True-color image: 3 channels of 32-bit floating point   values.
                          3 channels of 16-bit unsigned integer values.
                          3 channels of  8-bit unsigned integer values.

        List of currently supported features:

        Type   |     Read      |     Write     |
               | -file | -data | -file | -data |
        ----------------------------------------Gray ---------------------------------------Gray
        Gray   | Yes   | Yes   | Yes   | Yes   |
        RGB    | Yes   | Yes   | Yes   | Yes   |

        There are 2 supported file formats:
        One with the pure raw data only, the other with a 7 line ASCII header
        of the following form:

            Magic=RAW\n          File format identifier. Fixed value.
            Width=128\n          Image width in pixels.
            Height=128\n         Image height in pixels.
            NumChan=1\n          Possible values: 1 or 3.
            ByteOrder=Intel\n    Possible values: "Intel" or "Motorola".
            ScanOrder=TopDown\n  Possible values: "TopDown" or "BottomUp".
            PixelType=byte\n     Possible values: "float", "short" or "byte".



RAW OPTIONS
       The handler provides the following options:

       -verbose bool
              This option is supported for reading and writing.

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

       -useheader bool
              This option is supported for reading and writing.

              If set to true, use the file header information for reading and writing.  Default is true.

       -nchan int
              This option is supported for reading and writing image data without header.

              Specify the number of channels of the input image.  Default is 1.

       -width int
              This option is supported for reading image data without header only.

              Specify the width of the input image.  Default is 128.

       -height int
              This option is supported for reading image data without header only.

              Specify the height of the input image.  Default is 128.

       -byteorder string
              This option is supported for reading image data without header only.

              Specify  the  byteorder of the input image data.  Possible values: Intel or Motorola.  Default
              is assuming the same byteorder as that of the host computer.

       -uuencode bool
              This option is supported for reading image data without header only.

              If set to false, do not assume, that the image data stored in a  Tcl  variable  is  uuencoded.
              Default is true, i.e. the image data in a Tcl variable is assumed to be uuencoded.

       -scanorder string
              This option is supported for reading and writing image data without header.

              Specify the scanline order of the input image.  Possible values: TopDown or BottomUp.  Default
              is assuming the same byteorder as that of the host computer.

       -pixeltype string
              This option is supported for reading image data without header only.

              Specify the type of the pixel values.  Possible values: float or short or  byte.   Default  is
              byte.

              RAW files are always written in byte pixel format.

       -gamma float
              This option is supported for reading only.

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

       -nomap bool
              This option is supported for reading only.

              If set to true, no mapping of input values is done.  Use this option, if  your  image  already
              contains RGB values in the range of 0 .. 255.  Default is false.

       -min float
              This option is supported for reading only.

              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 image data.

       -max float
              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 image 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, imgps,
       ps, img-raw, img-sgi, img-sun, img-tga, img-tiff, img-window, img-xbm, img-xpm

KEYWORDS
       image handling, raw, tk

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




Img                                                  1.4                                          img-raw(n)