PPMTOICR

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:
          giftoppm 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.