Manual: ppmtoicr

Ppmtoicr User Manual(1)				   General Commands Manual			     Ppmtoicr User Manual(1)

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 col‐
       ormap 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  ),
       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 fac‐
       tor 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 Tech‐
       nology.

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

netpbm documentation					17 July 2022				     Ppmtoicr User Manual(1)