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List:       kde-kimageshop
Subject:    Re: Design of KisCurveIterator
From:       Casper Boemann <cbr () boemann ! dk>
Date:       2006-05-28 16:22:46
Message-ID: 200605281822.46160.cbr () boemann ! dk
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On Sunday 28 May 2006 17:44, Cyrille Berger wrote:
> On Sunday 28 May 2006 15:28, Boudewijn Rempt wrote:
> > Subsampling is interesting, since we've already got several strategies
> > for subsampling. I'm thinking that what's needed is a low-level iterator
> > that returns a vector of four pixels according to the path defined by the
> > function, in core/tile. And then a high-level subsampling iterator that
> > takes these four pixels and subsamples it using our filter strategies in
> > core/.
>
> seems cool but someone will have to explain me the filter strategies. Are
> they used to transform the weight associated with each pixels ?
No they simply provide the weight based on the distance. And they are 
one-dimensional.

For subsampling without scaling I would just calculate the area-based wieghts 
directly But remember to do the actual blending via colorspaces, so 
Boudewijn's reply is spot on.

However I too (like Bart) have reservations about bloating tiles with new 
iterators at all.

-- 
best regards / venlig hilsen
Casper Boemann
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