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Ppmtoicr User Manual(0)				       Ppmtoicr User Manual(0)

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 Interac‐
       tive 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  charac‐
       teristics  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 col‐
       ors on the display, then load the picture data into the window.

       Note that there is no icrtoppm tool - this transformation is one way.

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 exam‐
	      ple, 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

       -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 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-Cham‐
       paign (1989)

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

netpbm documentation		 30 July 1990	       Ppmtoicr User Manual(0)

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