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List:       kde-kimageshop
Subject:    Re: Histogram idea
From:       Boudewijn Rempt <boud () valdyas ! org>
Date:       2005-09-06 9:16:53
Message-ID: 200509061117.00022.boud () valdyas ! org
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On Tuesday 06 September 2005 10:46, Bart Coppens wrote:
> On Tuesday 06 September 2005 09:28, Boudewijn Rempt wrote:
> > Arguments? Discussions? Disagreements?
>
> While this is a very nice idea, I get the impression that our histogram
> still updates a too slow. And that's even when we implement the 'get all
> colors at once' idea from our previous histogram discussion.

Have you already experimented with that idea? Maybe it's an idea to profile 
the histogram plugin, then.

> Maybe we could cache histogram values of 128x128 pixel blocks, but that
> would probably mean that we'd have to do some less nice things (with tiles)
> to achieve that, I think.

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.

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

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