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List:       kde-kimageshop
Subject:    Re: koffice/libs/store
From:       Boudewijn Rempt <boud () valdyas ! org>
Date:       2006-11-26 19:39:29
Message-ID: 200611262039.30055.boud () valdyas ! org
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On Sunday 26 November 2006 17:07, Ariya Hidayat wrote:
> > I'm wondering: how hard would it be to use this compression for Krita's
> > tiles? Those are 64x64 pixels of 1 or 32 bytes. Especially for our undo
> > tile cache, compression might save a ton of memory. But on the other
> > hand, maybe the chunks are too small to compress nicely.
>
> 256 bytes sound possible to me. Perhaps Wilson-Kaplan algorithm is
> better here than Lempel-Ziv.
>
> The best is if you send couple of memory dumps of those tiles that I
> can play with.

This is a fairly typical example of a file we work with in Krita. Imagine that 
when applying a filter all tiles in the entire layer are saved as undo 
information -- the layer unzipped is 40 mb, the tgz'ed tiles separate 9mb.

http://www.valdyas.org/~boud/tiles.tgz
http://www.valdyas.org/~boud/Portrait.kra

-- 
Boudewijn Rempt 
http://www.valdyas.org/fading/index.cgi

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