These are chat archives for openseadragon/openseadragon
smoothTileEdgesMinZoom: Infinityin your options (on 2.2.1)
viewer.viewport.pixelFromPoint(new OpenSeadragon.Point(0, 0)). Is this an absolute point at the top of the image, or is it relative to what's currently visible?
viewer.viewport.getBounds().getCenter()will give you the center of the current view in viewport coordinates, and
viewer.addOverlaytakes viewport coordinates, so that should be perfect