openseadragon cannot open big legacy image pyramids image?

[sommour]

I try to use this mode：
http://openseadragon.github.io/examples/tilesource-legacy/
my code is:
<script type="text/javascript"> var viewer = OpenSeadragon({ id: "contentDiv", prefixUrl: "images/", tileSources: { type: 'legacy-image-pyramid', levels:[{ url: 'image2/4.jpg', height: 1280, width: 1280 },{ url: 'image2/3.jpg', height: 2560, width: 2560 },{ url: 'image2/2.jpg', height: 5120, width: 5120 },{ url: 'image2/1.jpg', height: 10240, width: 10240 },{ url: 'image2/0.jpg', height: 20480, width: 20480 }] }, showNavigator:true }); </script>
when it run in the browser(IE or Chrome), zoom into the big image(0.jpg (20480 X 20480)), the browser will become blank. when it turn to smaller image(1.jpg (10240 X 10240)), the browser will show normal.

why? because the browser memory Limit ?

thank you!

[iangilman]

Yes, it's quite possible your browser doesn't want to load that giant image. It's definitely big enough that it would be worth tiling it if you can.

I'm curious... can you share a link to the image so I can take a look?

[sommour]

@iangilman OK, I put it : http://www.scinly.com/test/ , but it seems work normal. But I tested it in my local compute, not online. can you download it (link: https://pan.baidu.com/s/1zujASxqOo93lqOXhvrXQ1w password: xu7a ) and try it in your compute ? thank you. if you cannot download it, I can send it using email.

PS: by the way, using the legacy image pyramids model, if i zoom in to the maximum layer, it must load the whole biggest image(like 0.jpg (20480 X 20480)) or just load the regional biggest image that shown in the interface ? I test it, I think it load the whole image, am I right? if so, this model(legacy image pyramids) is not useful(Compared to other models)

[iangilman]

So it does work for you on a server? Then maybe just don't worry about the fact that it doesn't work locally?

But yes, the legacy tile source loads the entire tile for the appropriate level; it can't load just a region of that tile. Looks like your largest tile is dozens of megabytes in size, so that's definitely way too big for a reasonable user experience. I'm still downloading your largest tile, but the second largest (1.jpg) is 12mb and it took almost 2 minutes to load for me.

You should look into tiling it with one of the tools listed here:

http://openseadragon.github.io/examples/creating-zooming-images/

[sommour]

@iangilman Thank you for answer. I am trying to using zooming image format. The legacy image pyramids may be used by Tiff format, like openslide.

But I think legacy image pyramids is more simple and convenience. So I hope that I can know the reason of this question. Thanks again.

[iangilman]

The tiled formats (like DZI, for instance) have the advantage of breaking the large levels into small, bite-size pieces. That way you never need to load a single 40 MB image. Transferring 40 MB can take several minutes on some connections, so it's definitely worth the trouble!