[A83] Re: ZPic83 compression

To: assembly-83@lists.ticalc.org
Subject: [A83] Re: ZPic83 compression
From: "Wouter v.d. Put" <woutput@hotmail.com>
Date: Mon, 10 Jun 2002 16:21:41 +0200
Reply-To: assembly-83@lists.ticalc.org


>Theres the prob i personally see with RLE (to some extent).  To compress a
>string of chars, it has to add two bytes.  Yes, say, a horozontal line 
>would

!!! You said: horizontal line, but maybe you could get a better compression 
by compressing vertical lines (for example with a pic that consists of 
vertical black and white lines)
I think the only solution for this is trying both (vertical and horizontal) 
methods and after that comparing the size of the two files.

>be compressed majorly, but a 'real' pic (a drawing) would very likley be 
>not
>compressed much, if at all.
>
>Also: Special byte.  A picture can (and most likley one out there will) use
>every combonation from $00 to $FF.  Chosing any old byte is impossible,
>unless you then convert any ocourances of your special byte in the pic to
>[special byte], $01, [special byte]
>
>Did i explain that well enough?  I hope so.  That takes up more space too 
>:(
>
>Thats why i was interested in getting info/code on the zpic83 compression,
>as it appears to be excelent at compressing pics.
>
>While im on the topic:  Program compression.  I heard talk about it, but
>none seems to eventuate.  XZip is IMHO very poor.  Whats the deal?
>
>-Nat


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