Raster Manager is the name of the principal module in MicroStation that is responsible for opening and visualizing raster imagery in MicroStation.
Using Raster Manager you can open and display images of various formats, from monochrome to full color. Single images, or groups of images, can be set to display in one or more DGN file views. MicroStation's drawing and annotation tools still can be used in views that display raster images.
You can modify the location, display order, and various other settings of previously attached raster image files. Changes can be made via the Element Information dialog , the Modify tool, or the attachment information section of the Raster Manager dialog. Additionally, the Warp tool lets you fit (warp) a raster image to a particular shape.
When you display a raster image file in a DGN file, it is attached in a Raster Reference Attachment. When a raster attachment is modified with Raster Manager, no changes are made to the original file, just to its attachment information in the DGN file. To make permanent changes to the image, please refer to Bentley Descartes: http://www.bentley.com/en-US/Products/Bentley+Descartes/
Raster Manager provides the opening and visualization of more than 30 raster file formats, many of them are also supported in creation mode. For more information about the raster file format handling capabilities of Raster Manager, please visit the following wiki page Raster File Format Handling .
Raster Manager supports some server streaming technologies allowing the remote access of raster stored on a server such as WMS and ECWP. For more information about the accessing remote raster data, refer to the following wiki page: Server Streaming Raster Visualization
Raster Manager is supports the opening and visualizing of the PDF files by utilizing Adobe technology. This preserves data integrity and ensures that the data is presented as accurately as Adobe Acrobat. Visit the wiki page PDF File Handling for more information.
Raster Manager supports on-the-fly reprojection of rasters when given the geo-coding and georeference information. Visit the wiki page Raster Reprojection for more information about the reprojection capabilities of Raster Manager.
Basic raster editing is available and you can learn more about this in the following wiki page: Basic Raster Editing.