Re: image bitmap problem

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Article #412

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#412

From: Graham Beint
Date: Tue, 07 Apr 1992 19:44

43 lines
1306 bytes

In article <1992Apr3.225050.10661@mlb.semi.harris.com> jmt@semi.harris.com writes:

...

>%!
>/DataString 848 string def
>848 2550 1 [848 0 0 -2550 0 2550] {

...

>.
>.
>00
>00
>00	% last line of data
>showpage	% print this sucker!

>When I send this to my Apple LWIIntx the busy light blinks forever,

...

>Looking at the line that says:
>848 2550 1 [848 0 0 -2550 0 2550] {

>(848 x 2550)pixels x 1 bit  x 1 Byte = 270300 Bytes 
>                     ------   ------  
>                     1 pixel  8 bits
>

>Am I making some kind of stupid error here or what?
>

Yes,  try /DataString 106 string def

You are reading in blocks of 8 raster lines and 2550 mod 8 is 6 not 0

So if you pad the data with an extra  212 lines of 

%00

(readhexstring will ignore % characters) you shoud be ok too

Prefixing each line of hex with a percent is probably good practice.

Technical Details

Message-ID: <1434@uniplex.co.uk>

Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!uknet!acorn!uniplex!gb

References: <1992Apr3.225050.10661@mlb.semi.harris.com>

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Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!uknet!acorn!uniplex!gb
From: gb@uniplex.co.uk (Graham Beint)
Newsgroups: comp.lang.postscript
Subject: Re: image bitmap problem
Message-ID: <1434@uniplex.co.uk>
Date: 7 Apr 92 19:44:04 GMT
References: <1992Apr3.225050.10661@mlb.semi.harris.com>
Reply-To: gb@uniplex.UUCP (Graham Beint)
Organization: Uniplex Limited, Redwood House, Hemel Hempstead
Lines: 43

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