scaleFactors is a comma-separated list of scaling factors by which the tiles for the display are scaled down. For example, if factors 1 and 32 are specified, only tiles that display the image in 1/32 scale will be displayed. When zooming in, these tiles are replaced by tiles that show the image in full resolution. It is common, but not mandatory, to scale in powers of two. However, these values are only guidelines for the underlying OpenSeadragon implementation, which typically uses multiple magnifications between the specified values.