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    gifColors()

         Returns the number of colours of a GIF

    Syntax:

         gifIsGIF ( cFile ) -> nColors

         cFile : Name of the GIF file

    Description:

         This function returns the number of colours that contains the GIF
         image.

    Return:

         A value between 2 y 256 indicating the number of colours or Nil if
         the file does not have GIF format.

    Example:

         ? gifColors ( "c:\xx\giveme.gif" )
See Also: gifIsGIF()
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