Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!samsung!munnari.oz.au!ditmela!agi.oz!shn
From: shn@allgfx.agi.oz (Si-Hanh Nguyen)
Newsgroups: comp.lang.postscript
Subject: Re: how to send binary images to LaserWriter ?
Message-ID: <1990May8.065455.23290@allgfx.agi.oz>
Date: 8 May 90 06:54:55 GMT
References: <7788@latcs1.oz.au>
Reply-To: shn@allgfx.oz.au (Si-Hanh Nguyen)
Organization: All Graphic Industries. Melbourne Australia.
Lines: 40

In article <7788@latcs1.oz.au> nguyensh@latcs1.oz.au (Si-Hanh Nguyen) writes:
> Does anybody know how to send images in binary (instead of hex)
> ...
> The printer is Apple LaserWriter, serial, 9600 bauds.
> ...
> Si-Hanh Nguyen

I would like to add some more info. to my yesterday posting.

I am trying to find a way to send 8-bit transparent data over the 
serial line, from a Sun 3/50 to an Apple LaserWriter. The reason 
is I would like to send image in binary instead of in hexadecimal.
The problem is images in binary form contains control characters 
such as ^D, ^C, ^T  which have special meanings to the LaserWriter.

The "transparent" boolean is mentioned in "Inside PostScript, Frank 
Merritt Braswell, Systems of Merit & Peachpit Press  1989", page 13-5. 
If its value is TRUE then the serial chanel is opened in transparent 
mode. I test the folllowing code, it does not work, ^T is still 
intepreted as a query :


% begin test
serverdict begin 0 exitserver	    % have to exit server
serverdict /transparent true put    % to modify serverdict
300 400 translate 72 72 scale 	    % 
8 8 1 [8 0 0 8 0 0] { (^T0) } 	    % image in binary
image 				    
showpage
%end test


Has anybody tried that /transparent before ?
And any help in 8-bit transparent data will be greatly appreciated.


Si-Hanh Nguyen
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nguyensh@lastcs1.oz	OR	shn@allgfx.agi.oz.au
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