MENU BACKGROUND background

   For vesamenu.c32, sets the background image.  The background
   can either be a color (see MENU COLOR) or the name of an image
   file, which should be 640x480 pixels and either in PNG or JPEG
   format.

   ++++ DISPLAY FILE FORMAT ++++

DISPLAY and function-key help files are text files in either DOS or UNIX
format (with or without <CR>).  In addition, the following special codes
are interpreted:

<CAN>filename<newline>         <CAN> = <Ctrl-X> = ASCII 24
   If a VGA display is present, enter graphics mode and display
   the graphic included in the specified file.  The file format
   is an ad hoc format called LSS16; the included Perl program
   "ppmtolss16" can be used to produce these images.  This Perl
   program also includes the file format specification.

   The image is displayed in 640x480 16-color mode.  Once in
   graphics mode, the display attributes (set by <SI> code
   sequences) work slightly differently: the background color is
   ignored, and the foreground colors are the 16 colors specified
   in the image file.  For that reason, ppmtolss16 allows you to
   specify that certain colors should be assigned to specific
   color indicies.

   Color indicies 0 and 7, in particular, should be chosen with
   care: 0 is the background color, and 7 is the color used for
   the text printed by Syslinux itself.