ppmtoicr(1)                                                   General Commands Manual                                                  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 sup-
       plied, 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.

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.

                                                                   30 July 1990                                                        ppmtoicr(1)