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img-ppm(n)                                                                                        img-ppm(n)



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NAME
       img-ppm - Img, Portable Pixmap format (ppm)

SYNOPSIS
       package require Tk

       package require img::ppm  ?1.4?

       image create photo ?name? ?options?

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DESCRIPTION
       The package img::ppm 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::ppm.

       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 Portable Pixmap format (ppm). More specifi-cally specifically
       cally img::ppm extends Tk's photo image type.

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

       All of the above means that in a call like

       image create photo ?name? ?options?


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

       [2]    The format name ppm 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 PPM OPTIONS.


SUPPORTED PPM TYPES
       This handler supports the PPM (Truecolor) and PGM (Greyscale) image formats.  There are two types  of
       PPM/PGM  files:  RAW (binary) and ASCII.  The values stored in PPM/PGM files can be unsigned 8-bit or
       unsigned 16-bit values.


        Grayscale (PGM): 8-bit and 16-bit, 1 channel per pixel.
        Truecolor (PPM): 8-bit and 16-bit, 3 channels per pixel.

        List of currently supported features:

        Type              |     Read      |     Write     |
                          | -file | -data | -file | -data |
        ---------------------------------------------------PGM --------------------------------------------------PGM
        PGM  8-bit ASCII  | Yes   | Yes   | No    | No    |
        PGM  8-bit BINARY | Yes   | Yes   | No    | No    |
        PGM 16-bit ASCII  | Yes   | Yes   | No    | No    |
        PGM 16-bit BINARY | Yes   | Yes   | No    | No    |
        PPM  8-bit ASCII  | Yes   | Yes   | Yes   | Yes   |
        PPM  8-bit BINARY | Yes   | Yes   | Yes   | Yes   |
        PPM 16-bit ASCII  | Yes   | Yes   | No    | No    |
        PPM 16-bit BINARY | Yes   | Yes   | No    | No    |



PPM 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.

       -scanorder string
              This option is supported for reading only.

              Specify  the scanline order of the input image.  Possible values: TopDown or BottomUp. Default
              is TopDown.

       -gamma float
              This option is supported for reading only.

              Specify a gamma correction to be applied when mapping 16-bit input data to 8-bit image values.
              Default is 1.0.

       -min float
              This option is supported for reading only.

              Specify  the  minimum pixel value to be used for mapping 16-bit input data to 8-bit image val-ues. values.
              ues.  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 16-bit input data to 8-bit  image  val-ues. values.
              ues.  Default is the maximum value found in the image data.

       -ascii bool
              This  option  is supported for writing only.  If set to true, the file is written in PPM 8-bit
              ASCII format (P3).  Default is false, i.e. write in PPM 8-bit binary format (P6).



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, ppm, tk

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




Img                                                  1.4                                          img-ppm(n)