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img-png(n)                                                                                        img-png(n)



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NAME
       img-png - Img, Portable Network Graphics format (png)

SYNOPSIS
       package require Tk

       package require img::png  ?1.3?

       image create photo ?name? ?options?

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DESCRIPTION
       The package img::png 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::png.

       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 Network Graphics format (png).
       More specifically img::png extends Tk's photo image type.

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

       All of the above means that in a call like

       image create photo ?name? ?options?


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

       [2]    The format name png 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 PNG OPTIONS.


PNG OPTIONS
       The handler provides no true options at all, but accepts pairs of keys and values when writing a  PNG
       file.  Each  pair  will be written as a named text chunk where the key provides the name of the chunk
       and the value its contents.  For example

           png Author <name> Title <title> Description ...


TRANSPARENCY
       If you want to write images to disk which contain transparency information (e.g. PNG with alpha chan-nel) channel)
       nel) you need at least Tk 8.3.


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

KEYWORDS
       image handling, png, tk

COPYRIGHT
       Copyright (c) 1995-2003 Jan Nijtmans <nijtmans@users.sourceforge.net>




Img                                                  1.3                                          img-png(n)