Full Image
This option is dedicated for small medium images which do not required to use tilled images.
On the fly tilled image
This option is dedicated for larges images which do not required to use pre computed tilled images. This option is recommended for access by IA to the full image. Images about 50 MPx corresponding to full frame camera images are in this category.
Pre tilled images
This option is dedicated for very larges images (megapixel) produced by stitching of images or resulting of very high resolution sensors. The pre-computing of the tilled images allows very fast access to the extremely large images.