# Properties of Blobs

Once an image has been segmented, and the blob or blobs have been located and identified, an application can begin to consider information about the blob or blobs.

A blob is an arbitrary two-dimensional shape. The shape of a blob can be described using a number of different measures. The measures that the Blob tool returns fall into the following categories:

- Geometric properties
- Nongeometric properties
- Topological properties

Each of these groups of properties is described in detail in the following sections.