NAME

       ppmtoicr - convert a PPM image into NCSA ICR format

SYNOPSIS

       ppmtoicr

       [-windowname name]

       [-expand expand]

       [-display display]

       [ppmfile]

       Minimum unique abbreviation of option is acceptable.  You may use double hyphens instead of single hyphen
       to denote options.  You may use white space in place of the equals sign to separate an option  name  from
       its value.

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.

              name must be printable characters, and not '^'.

              Default is to use the input file name if specified on the command line or
                "untitled" if the input is from Standard Input.  In the former case, any
                unprintable character or '^' in the file name becomes a
                '.' in the window name.

       -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:

           giftopnm giffile | ppmtoicr -windowname=giffile -expand=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