Background

Raster references are saved as type 90 elements in the design file. These type 90 attachments also are used by IRAS/B, IRAS/C and other Intergraph products. For this reason Bentley cannot modify the basic format of this data without causing compatibility problems. Raster Manager, however, has extended these elements in a compatible way and favors the use of these extended type 90 elements to save information about raster attachments.

Image Manager uses project files to save information about raster attachments. With Raster Manager, project files still are supported, but now they are useful only for attaching a mosaic of raster files to multiple design files. If raster files are associated with a single design file, it is preferable to change to Raster Reference (type 90) attachments.