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Why zoom to more than 100%?
Why does the viewer allow zooming in to such a high magnification? What is the point of being able to zoom to more than 100%? The image becomes pixellated and blurry at the highest zoom levels. I couldn't figure out how to constrain the max zoom using just the Deep Zoom Composer - can it be done?
I’m curious
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Inappropriate?Hi Malcolm,
I haven't found a way of limiting this inside of DZC itself - other than making the image invisible once you hit maximum - but that is a little cumbersome.
However, if you are using Seadragon Ajax you can limit this inside of the seadragon library.
On line 8 you will see find the following:
maxZoomPixelRatio:4
This sets the maximum zoom level to four times the actual size of the image, you can change this to 1 times simpyl with the following code
maxZoomPixelRatio:1
Thanks
Anthony
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this answers the question
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Inappropriate?Yes I found that. Quite simple really. Thanks for the reply
Malcolm -
Inappropriate?Hi Malcolm,
That's a good question. We let you go past 100% by default because it's not uncommon for people to be on high-DPI displays. For them, zooming in past 100% doesn't really make it blurry -- it in fact makes details more visible.
As Anthony pointed out, this limit is configurable in Seadragon Ajax. But it's actually easier than changing the source directly -- it's exposed via an API. Simply add this line to your app:
Seadragon.Config.maxZoomPixelRatio = 1;
You can check out the documentation for that and other "knobs" inside Seadragon.Config.
By the way, our default used to let you zoom into 400% (as Anthony's code snippet shows), but we recently changed the default to 200%. You might like that default better.
Let us know if you have any other questions!
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this answers the question
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Inappropriate?Hi Aseem,
thank you. I figured out how to control it. It's just that I was playing with it for the first time and couldn't see how it might be achieved with the DZC. Once I dived into the code it was quite simple to constrain. I'm a bit puzzled by your statement that zooming past 1:1 would show more detail on a high dpi display though. I can't see how, when you get beyond the actual pixels, you would see more detail. My display is 1920 x 1200 and the image quality degrades when you zoom past full size. Anyway it's a cool thing and I like it so will be playing with it some more for sure.
I’m quite content actually
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