Provided by: libtk-img-doc_1.4.13+dfsg-1_all bug

NAME
       img-gif - Img, Graphics Interchange Format (gif)


SYNOPSIS
       package require Tk

       package require img::gif  ?1.4?

       image create photo ?name? ?options?

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DESCRIPTION
       The package img::gif 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::gif.

       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  Graphics  Interchange  Format  (gif).  More
       specifically img::gif extends Tk's photo image type.

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

       All of the above means that in a call like

       image create photo ?name? ?options?

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

       [2]    The format name gif 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 GIF OPTIONS.


GIF OPTIONS
       The  handler provides two options, one for reading from a GIF image, the other influencing the writing of
       such.

       -index n
              This option is for reading from GIF files containing more than  one  image  (animated  GIF's,  GIF
              movies.  When specified it will read the n'th image in the data. The first image is at index 0 and
              will be read by default, i.e. when the option is not specified.

       -interlaced bool
              If the value of this option is set to true the image will be written  using  the  interlaced  sub-
              format of GIF. The default is to write non-interlaced files. This option is not implemented yet.


IMAGE COMPRESSION
       Instead  of  LZW  the run-length encoding of Hutchison Avenue Software Corporation is used, also known as
       miGIF compression. The miGIF compression routines do not, strictly speaking, generate files conforming to
       the GIF spec, since the image data  is  not  LZW-compressed  (this  is  the  point:  in  order  to  avoid
       transgression  of the Unisys patent on the LZW algorithm.) However, miGIF generates data streams that any
       reasonably sane LZW decompresser will decompress to what we want.


TRANSPARENCY
       If you want to write images to disk which contain transparency information (e.g. GIF89) you need at least
       Tk 8.3.


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
       gif, image handling, tk


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

img-gif                                                1.4                                          img-gif(3tk)