Multi-Image slots

[stanislavkostadinov]

I've implemented multi-image slots for the next release. Users can select as many images as they want to see. Images with different size will be aligned to the upper left corner.

I haven't umplemented yet a panel with transparency scrollbar for each image and functionality for rearranging the order of the images.

This functionality is useful when users compare two images of one artefact (e.g. image of painting and semi-transparent x-ray image of the same painting).

[yuricus]

That's great and I'm looking forward to see it.

There's implementation of this feature in other frameworks (i.e. http://merovingio.c2rmf.cnrs.fr/iipimage/iipmooviewer/vangogh.html), it would be glad to see it here.

[stanislavkostadinov]

I've tried to reuse some of the controls from http://165.134.241.141/brokenBooks/getManifest.html

The problem is that current OSD has opacity property per canvas and I need opacity per tile image (I think this is newer version - https://openseadragon.github.io/docs/OpenSeadragon.Viewer.html#addTiledImage)

[stanislavkostadinov]

Initial version of multi-image slots: https://www.youtube.com/watch?v=mokOyLMlaro