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       ppmtoicr - convert a portable pixmap into NCSA ICR format


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


       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

       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.


                     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.)

                     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.)


       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


       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.



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


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

                                           30 July 1990                               ppmtoicr(1)