Re: Pure Quartz vs. Cocoa-Objects ... why is Quartz slower?
Re: Pure Quartz vs. Cocoa-Objects ... why is Quartz slower?
- Subject: Re: Pure Quartz vs. Cocoa-Objects ... why is Quartz slower?
- From: Andy Armstrong <email@hidden>
- Date: Sun, 13 Feb 2005 09:38:01 +0000
On 13 Feb 2005, at 01:46, Michael Becker wrote:
My idea now is to specify certain thresholds where the images get
recached in different sizes. So if you zoom them smaller than 100
pixels wide, the image gets recached in a 40 pixels wide format... I
am not sure.
Yes, that's the way to go. I'm writing a mapping application at the
moment which uses 200 pixel square tiles. Zooming in is fine but
zooming out (say 4x) might mean that I'm attempting to resample
hundreds of images. For my application I'm using precomputed tiles at
lower resolutions (so for every four 200 pixel squares I have a 200
pixel half resolution square and so on - a kind of quadtree of tiles).
The one thing that I don't yet fully understand is, how iPhoto creates
this "delayed quality improvement" thing. That means, if you zoom the
images, their quality is fairly bad, but gets automatically updated
after a couple of moments.
I'm not sure but I assume it just does nearest neighbour resampling
initially and then bicubic or something slower after a delay.
--
Andy Armstrong, hexten.net
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