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ppmtoicr(1)

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.

AUTHOR

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

                             30 July 1990                      ppmtoicr(1)

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