ppmtoicr(1)                                           ppmtoicr(1)

       ppmtoicr - convert a portable pixmap into NCSA ICR format

       ppmtoicr  [-windowname  name]  [-expand  expand] [-display
       display] [-rle] [ppmfile]

       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  stan-
       dard input.

       Interactive  Color Raster (ICR) is a protocol for display-
       ing 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  Tek-
       tronix 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.

                     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

                     Output  will be displayed on screen numbered

       -rle          Use run-length encoded format  for  display.
                     (This will nearly always result in a quicker
                     display, but may skew the colormap.)

       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 down-
       load a colormap of up to 256 colors, and download the pic-
       ture  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

       The protocol uses frequent fflush calls to speed  up  dis-
       play.  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.


       NCSA Telnet for the Macintosh, University of  Illinois  at
       Urbana-Champaign (1989)

       Copyright  (C)  1990  by  Kanthan Pillay (svpillay@Prince-
       ton.EDU), Princeton University Computing  and  Information

                           30 July 1990                         1