[A83] Re: ZPic83 compression

To: <assembly-83@lists.ticalc.org>
Subject: [A83] Re: ZPic83 compression
From: "Nat Allan" <nallan@hotkey.net.au>
Date: Mon, 10 Jun 2002 20:47:03 +1000
References: <20020610075430.4659E18007@mx-1.sollentuna.net>
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
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

Follow-Ups:

[A83] Re: ZPic83 compression

From: =?ISO-8859-1?Q?M=E1rio_Rui_Luzeiro?= <ks@megamail.pt>

[A83] Re: ZPic83 compression

From: Rob van Wijk <robvanwijk@gmx.net>

References:

[A83] Re: ZPic83 compression

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