[A83] Re: ZPic83 compression

To: assembly-83@lists.ticalc.org
Subject: [A83] Re: ZPic83 compression
From: =?ISO-8859-1?Q?M=E1rio_Rui_Luzeiro?= <ks@megamail.pt>
Date: Mon, 10 Jun 2002 11:50:16 +0100
In-reply-to: <000501c2106c$2958e800$5c8d86cb@l3o6v0>
References: <20020610075430.4659E18007@mx-1.sollentuna.net> <000501c2106c$2958e800$5c8d86cb@l3o6v0>
Reply-To: assembly-83@lists.ticalc.org
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Where are the program?
I can't find it in 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
> 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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References:

[A83] Re: ZPic83 compression

From: "Henk Poley" <hpoley@dds.nl>

[A83] Re: ZPic83 compression

From: "Nat Allan" <nallan@hotkey.net.au>