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]
[-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
In addition to the options common to all programs based on libnetpbm
(most notably -quiet, see
Common Options ⟨index.html#commonoptions⟩ ), ppmtoicr recognizes the
following command line 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 ev-
ery 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 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)
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 compres-
sion. But because of a simple bug in option processing code, the op-
tion 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), Prince-
ton University Computing and Information Technology.
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 05 June 2015 Ppmtoicr User Manual(1)
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