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ppmtoicr(1) Unix Programmer's 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
-------
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
30 July 1990 1
ppmtoicr(1) Unix Programmer's Manual ppmtoicr(1)
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 2