[worldKit-dev] Smoothing (Anti-aliasing) of intermediate zooms when using Zoomify

[Mark]

  Thank you for all the replies!

  Unfortunately, I do not think it is the size of the
tile - we work with pic. dimensions 1008x768 and the
size of the tile (256px) is not a problem with the
pic.levels generated by Zoomify, i.e. when the size of
the pic. is divided by 2 elimination of pixels goes
smoothly. The problem is when WorldKit tries to
generate an image (an approximation) at a scale of say
1.5 compared to a Zoomify generated level (pic.
generation on the fly). Then the appearance is jagged.
We feel the solution should be relatively easy and
done using the standard Flash anti-aliasing tools.
Hopefully, in a week or two, I will be able to write
again with more detail on the way things are going.

Best regards, Mark


--- Mikel Maron <mikel_maron at yahoo.com> wrote:

> Yes, looks like worldKit is assuming a 256 square
> tiles, but Zoomify can produce other tile
> dimensions. Might be an easy fix then.
> 
> Mark, do you have an example we can look at?
> 
> ----- Original Message ----
> From: Brent Pedersen <bpederse at gmail.com>
> To: Discussion of worldKit use and development
> <worldkit-dev at lists.brainoff.com>
> Sent: Wednesday, March 26, 2008 8:34:20 PM
> Subject: Re: [worldKit-dev] Smoothing
> (Anti-aliasing) of intermediate zooms when using
> Zoomify
> 
> just a wild guess here, but given:
> > if the original is 1024px times 1024px the scaled
> down version 512x512 and 256x256
> > are smooth (these are produced by Zoomify), but
> 378x378 and 768x768 are jagged
> 
> and then look at this line:
>
http://worldkit.org/trac/browser/worldkit/com/brainoff/worldkitImages.as#L451
> could that 256 be the reason? i dont know anything
> about zoomify, so
> that may be way off.
> 
> -brent
> 
> 
> 
> On Wed, Mar 26, 2008 at 7:10 PM, Mikel Maron
> <mikel_maron at yahoo.com> wrote:
> >
> > Hi Mark
> >
> > Thanks for bringing this up, it's an issue that's
> been raised before and
> > needs looking into.
> >
> > http://worldkit.org/trac/ticket/153
> >
> > Really this needs someone to pick up and focus on
> what's going here.
> > Obviously worldKit can do better,
> > because Zoomify is handling things better.
> >
> > I myself won't have time in the foreseeable
> future. Though there is one good
> > development -- next week
> > Brent Pederson and I are having a mini-hackfest on
> worldKit, in order to get
> > mtasc compilation fully working.
> > After that, hopefully, development of worldKit
> will be completely open
> > source.
> >
> > -Mikel
> >
> > ----- Original Message ----
> > From: Mark <markgavor at yahoo.com>
> > To: worldkit-dev at lists.brainoff.com
> > Sent: Wednesday, March 26, 2008 3:52:29 AM
> > Subject: [worldKit-dev] Smoothing (Anti-aliasing)
> of intermediate zooms when
> > using Zoomify
> >
> >    Hello everyone,
> >
> >   this is Mark writing. I am new to WorldKit, and
> I
> > have a question regarding the integration with
> > Zoomify.
> >
> >   Here is the problem I have: Some of the zoomed
> in
> > images are with smooth appearance, and some are
> > jagged. It depends on the relation of the size of
> the
> > original picture and the size of the scaled down
> > picture - if the width of the scaled down picture
> is
> > exactly the width of the original divided by a
> power
> > of 2 - the appearance is smooth. If it is a
> different
> > size - it is jagged. Example: if the original is
> > 1024px times 1024px the scaled down version
> 512x512
> > and 256x256 are smooth (these are produced by
> > Zoomify), but 378x378 and 768x768 are jagged
> (because
> > it is an approximation?).
> >
> > At the same time - the ZoomifyView smooths out
> even
> > the  378x378 and 768x768 versions - there are 3
> levels
> > of pictures but 5 levels of zoom.
> >
> > On a related note - the <zoomc> tag seems to be
> > inactive when <zoomifydir> is used.
> >
> > Any suggestions on getting a smoother appearance
> using
> > the very good WorldKit product?
> >
> > Best regards, Mark
> >
> >
> >
> >
>
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