The Isolation and Pervasiveness views are about highlighting reference density.
The Isolation view shades objects from cold (blue) to hot (more red) based on how “popular” they are with other objects. The actual incoming reference count is also displayed in the box at the start of each object. Darkest blue objects with a red zero count indicate objects that have no references at all within the heap itself. That does not necessarily mean they are orphans that have been leaked; they could be referenced from the stack or from static variables instead. However, if you do think you may have a memory leak then these zero count objects are a good place to start looking.
The Pervasiveness view is the inverse of the Isolation view. In Pervasiveness view, objects are shaded from cold (blue) to hot (more red) based on how many other objects they are “interested” in. The actual outgoing reference count is also displayed in the box at the start of the object. The other highlighted boxes within cells are the actual locations of the potential outgoing references Heap Analyser has identified. As pure data datatypes with no outgoing references, descriptors are distinguished in yellow here. If you have a memory leak, bright red objects may be worth investigating as the potential home to an abnormally large number of references. For example, the buffer object within a large array of pointers may be highlighted in this view, and in some cases could be the source of a leak e.g. due to forgetting to delete objects from the array when they’re no longer needed.