ppmtoicr



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 pixmap, 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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