A morphological image may record in a structure called Mimage all morpho sets and morpho lines the image contains. It is therefore potentially a very redundant (and very huge) structure, but this plenty of information may be useful to perform morphological operations. Of course, not all fields need to be set as the same time, for example a Mimage may contain the level lines only. But from this (complete) information, all other fields may be computed.
The Mimage structure has been created before the Shapes structure was developed (See Section 7.2). It does not use the tree structure associated to FLST-based algorithms. For this reason, the Shapes object should be preferred to the Mimage one for future developments.