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List:       kde-kimageshop
Subject:    Re: Histogram idea
From:       Casper Boemann <cbr () boemann ! dk>
Date:       2005-09-06 9:39:24
Message-ID: 200509061139.24946.cbr () boemann ! dk
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On Tuesday 06 September 2005 11:34, Bart Coppens wrote:
> On Tuesday 06 September 2005 11:16, Boudewijn Rempt wrote:
> > Have you already experimented with that idea? Maybe it's an idea to
> > profile the histogram plugin, then.
>
> I thought Casper was going to do that, but I don't mind playing a bit with
> it.
Well, I was working on getting the histogram into the curves widget, and 
though I eventually would have tried this it's not on the top of my todo 
list. So please go ahead.

> > It's that I really don't want to make the tiles interface public,
> > otherwise this would be a job for a tile annotation class -- there are
> > other places where caching information per tile might speed up
> > calculations a lot. Photoshop, for instance, caches several views per
> > tile, down to a one-pixel color-corrected rgb represention of a tile, to
> > speed up redisplay.
>
> I don't want to make the tiles public as well, that's why I said we'd have
> to do not-so-nice things :-( The idea of caching several things per tile is
> probably a lot efficient than reiterating over each and every pixel again.
> Like an overview widget could be made fast if you didn't have to resize the
> entire image each time you update something.
A simple iterations of pixels in the _destination_ and only sampling 1 pixel 
in the source per pixel in the destination would speed thumbnails and 
previews up.


btw. I'm not doing anything these days as I wait for debian to upgrade to gcc 
4.0 and kde 3.4.2 (any day now).

-- 
best regards / venlig hilsen
Casper Boemann
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