NAME

       ppmtoicr - convert a PPM image into NCSA ICR format

SYNOPSIS

       ppmtoicr

       [-windowname name]

       [-expand expand]

       [-display display]

       [-rle]

       [ppmfile]

DESCRIPTION

       This program is part of Netpbm(1).

       ppmtoicr  reads  a  PPM  file  as input.  Produces an NCSA Telnet Interactive Color Raster
       graphic file as output.

       If ppmfile is not supplied, ppmtoicr reads 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 image, 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

       In addition to the options common to all programs based on libnetpbm (most notably -quiet,
       see
        Common Options ⟨index.html#commonoptions⟩ ), ppmtoicr recognizes  the  following  command
       line options:

       -windowname name
              Output  will  be  displayed in name (Default is to use ppmfile or "untitled" if the
              input is from Standard Input).

       -expand expand
              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.)

       -display display
              Output will be displayed on screen numbered display

EXAMPLES

       To display a PPM file named ppmfile 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.  You may achieve the same effect with 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

LIMITATIONS

       The protocol uses frequent fflush() calls to speed up display.  If you save the output  to
       a  file  for  later display via cat, ppmtoicr will draw much more slowly.  In either case,
       increasing the blocksize limit on the display will speed up transmission substantially.

SEE ALSO

       ppm(1)

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

HISTORY

       Until Netpbm 10.71 (June 2015), there was a -rle option  documented,  which  was  said  to
       cause  the  output to use run length encoding compression.  But because of a simple bug in
       option processing code, the option never had any effect.  And the compression code did not
       look  like  it  worked anyway and would take a fair amount of work to fix.  Because it was
       unlikely anyone would ever use this program again,  much  less  want  to  use  run  length
       encoding, we removed it from the documentation rather than fix the code.

AUTHOR

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

DOCUMENT SOURCE

       This manual page was generated by the Netpbm tool 'makeman' from HTML source.  The  master
       documentation is at

              http://netpbm.sourceforge.net/doc/ppmtoicr.html