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+Network Working Group                                            A. Katz
+Request for Comments: 797                                            ISI
+                                                          September 1981
+
+
+                        FORMAT FOR BITMAP FILES
+
+   This note describes a proposed format for storing simple bitmaps (one
+   bit per pixel)  in a file.   These  files  may be very  large and the
+   intent  is to use this format for short term storage and passing data
+   between  closely  coupled  programs.   The data in the file should be
+   stored in 8-bit bytes (octets).  Bitmaps may be any size.
+
+   The first  4 octets  of the file  gives  the width  of each  line  (x
+   direction),  and the next 4 octets should give the number of lines of
+   the display  (length, y direction). After this is one octet for the x
+   increment  and one octet for the y  increment.   Following  these  10
+   octets  is the bitmap  itself.     The length  and width  fields  are
+   stored most significant octet first.
+
+   The x and y increment  octets  tell how much space is between pixels.
+   For an ordinary display, both these would be one.
+
+   Each line of the display  should  be scanned  from left to right. The
+   lines should start at the top and work down.  Each line in the bitmap
+   should  end on an octet boundary.  If the width of the display is not
+   divisable  by 8,  the rest of the last octet  should  be filled  with
+   zeros on the right.
+
+   Below  is a representation  of a bitmap  file  (each  square  is  one
+   octet):
+
+      ----------------------------------------------------------
+      |    1     |    2     |    3     |     4     |     5     |
+      |  width   |  width   |  width   |   width   |  length   |
+      ----------------------------------------------------------
+
+      ----------------------------------------------------------
+      |     6    |     7    |     8    |     9     |     10    |
+      |  length  |  length  |  length  |x-increment|y-increment|
+      ----------------------------------------------------------
+
+      ----------------------------------------------------------
+      |   11     |   12     |   13     |    14     |   15
+      |  data    |  data    |  data    |   data    |  data...
+      ----------------------------------------------------------
+
+   For example,  bitmaps  from the RAPICOM  450 can be in  Fine  Detail,
+   Quality,  or Express  Mode.   In Fine Detail mode the x-increment and
+   y-increment  would be 1, for Quality mode, the x-increment would be 1
+   and the y-increment would be 2, and for Express mode, the x-increment
+
+
+
+Alan R. Katz                                                    [page 1]
+
+
+                                                                        
+   would  be 1 and the y-increment  would be 3.  For these bitmaps it is
+   intended  that each scan line be repeated y-increment times when they
+   are displayed.
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+[page 2]                                                    Alan R. Katz
+