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NAME

       ppmtoicr - convert a portable pixmap into NCSA ICR format

SYNOPSIS

       ppmtoicr  [-windowname name] [-expand expand] [-display display] [-rle]
       [ppmfile]

DESCRIPTION

       Reads a portable  pixmap  file  as  input.   Produces  an  NCSA  Telnet
       Interactive  Color  Raster  graphic  file as output.  If ppmfile is not
       supplied, ppmtoicr will read from standard input.

       Interactive Color Raster (ICR) is  a  protocol  for  displaying  raster
       graphics  on  workstation  screens. The protocol is implemented in NCSA
       Telnet  for  the  Macintosh  version  2.3.   The  ICR  protocol  shares
       characteristics  of the Tektronix graphics terminal emulation protocol.
       For example, escape sequences are used to control the display.

       ppmtoicr will output the appropriate sequences to create  a  window  of
       the  dimensions  of  the  input  pixmap, create a colormap of up to 256
       colors on the display, then load the picture data into the window.

       Note that there is no icrtoppm tool - this transformation is one way.

OPTIONS

       -windownamename
                     Output will be displayed  in  name  (Default  is  to  use
                     ppmfile or "untitled" if standard input is read.)

       -expandexpand Output  will be expanded on display by factor expand (For
                     example, a value of  2  will  cause  four  pixels  to  be
                     displayed for every input pixel.)

       -displaydisplay
                     Output will be displayed on screen numbered display

       -rle          Use  run-length  encoded  format  for display. (This will
                     nearly always result in a quicker display, but  may  skew
                     the colormap.)

EXAMPLES

       To display a ppm file using the protocol:
           ppmtoicr ppmfile
       This will create a window named ppmfile on the display with the correct
       dimensions for ppmfile, create and download a colormap  of  up  to  256
       colors,  and  download the picture into the window. The same effect may
       be achieved by the following sequence:
           ppmtoicr ppmfile > filename
           cat filename
       To display a GIF file using the protocol in a window titled  after  the
       input  file,  zoom the displayed image by a factor of 2, and run-length
       encode the data:
           giftopnm giffile | ppmtoicr -w giffile -r -e 2

BUGS

       The protocol uses frequent fflush calls to speed  up  display.  If  the
       output  is  saved  to a file for later display via cat, drawing will be
       much slower. In either case, increasing  the  Blocksize  limit  on  the
       display will speed up transmission substantially.

SEE ALSO

       ppm(5)

       NCSA  Telnet  for  the  Macintosh,  University  of  Illinois at Urbana-
       Champaign (1989)

AUTHOR

       Copyright  (C)  1990  by   Kanthan   Pillay   (svpillay@Princeton.EDU),
       Princeton University Computing and Information Technology.

                                 30 July 1990                      ppmtoicr(1)