Hi,
First you say that the full images are used than you say it is a limit,
And what do you mean with tiled and multiresolution. What kind of full spherical panos are tiled but not multiresolution.
with 'full images' I'm meaing the 'normal', not <mobile> and not <tablet> images,
in the krpanoJS there is currently no multi-resolution - multi-resolution means for me, to load dynamically only that parts of the resolution that are necessary for the current view,
but tiled-loading is possible,
so in case of a multi-res pano the viewer looks for a <level> tag with a 'useable' size and loads just this level,
why the limit.
bigger single images are causing either an automatic down-sampling by the browser (=lower resolution anyway) or rendering errors (small lines between some browser-internal sub-images - both things are not controllable and also vary a bit from browser versions and systems,
so to make it working anywhere, there is this size limit at the moment, I have tested it successfully on all browsers and systems...
best regards,
Klaus