1Ppmtoicr User Manual(0) Ppmtoicr User Manual(0)
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6 ppmtoicr - convert a PPM image into NCSA ICR format
7
10 ppmtoicr
11 [-windowname name]
13 [-expand expand]
15 [-display display]
17 [-rle]
19 [ppmfile]
21
24 This program is part of Netpbm(1).
25 ppmtoicr reads a PPM file as input. Produces an NCSA Telnet Interac‐
27 tive Color Raster graphic file as output.
28 If ppmfile is not supplied, ppmtoicr reads from Standard Input.
30 Interactive Color Raster (ICR) is a protocol for displaying raster
32 graphics on workstation screens. The protocol is implemented in NCSA
33 Telnet for the Macintosh version 2.3. The ICR protocol shares charac‐
34 teristics of the Tektronix graphics terminal emulation protocol. For
35 example, escape sequences are used to control the display.
36 ppmtoicr will output the appropriate sequences to create a window of
38 the dimensions of the input image, create a colormap of up to 256 col‐
39 ors on the display, then load the picture data into the window.
40 Note that there is no icrtoppm tool - this transformation is one way.
42
45 In addition to the options common to all programs based on libnetpbm
46 (most notably -quiet, see
47 Common Options ⟨index.html#commonoptions⟩ ), ppmtoicr recognizes the
48 following command line options:
49 -windowname name
53 Output will be displayed in name (Default is to use ppmfile or
54 "untitled" if the input is from Standard Input).
55 -expand expand
58 Output will be expanded on display by factor expand (For exam‐
59 ple, a value of 2 will cause four pixels to be displayed for ev‐
60 ery input pixel.)
61 -display display
64 Output will be displayed on screen numbered display
65
70 To display a PPM file named ppmfile using the protocol:
71 ppmtoicr ppmfile
73 This will create a window named ppmfile on the display with the correct
76 dimensions for ppmfile, create and download a colormap of up to 256
77 colors, and download the picture into the window. You may achieve the
78 same effect with the following sequence:
79 ppmtoicr ppmfile > filename
81 cat filename
82 To display a GIF file using the protocol in a window titled after the
85 input file, zoom the displayed image by a factor of 2, and run-length
86 encode the data:
87 giftopnm giffile | ppmtoicr -w giffile -r -e 2
89
93 The protocol uses frequent fflush() calls to speed up display. If you
94 save the output to a file for later display via cat, ppmtoicr will draw
95 much more slowly. In either case, increasing the blocksize limit on
96 the display will speed up transmission substantially.
97
100 ppm(1)
101 NCSA Telnet for the Macintosh, University of Illinois at Urbana-Cham‐
103 paign (1989)
104
107 Until Netpbm 10.71 (June 2015), there was a -rle option documented,
108 which was said to cause the output to use run length encoding compres‐
109 sion. But because of a simple bug in option processing code, the op‐
110 tion never had any effect. And the compression code did not look like
111 it worked anyway and would take a fair amount of work to fix. Because
112 it was unlikely anyone would ever use this program again, much less
113 want to use run length encoding, we removed it from the documentation
114 rather than fix the code.
115
118 Copyright (C) 1990 by Kanthan Pillay (svpillay@Princeton.EDU), Prince‐
119 ton University Computing and Information Technology.
120
122 This manual page was generated by the Netpbm tool 'makeman' from HTML
123 source. The master documentation is at
124 http://netpbm.sourceforge.net/doc/ppmtoicr.html
126netpbm documentation 05 June 2015 Ppmtoicr User Manual(0)