Once a bitmap is placed in the design area, you can edit some of its properties, like resolution and color mode.
See Also
Working with Bitmaps
Changing Bitmap Resolution
Resampling a Bitmap
Changing Bitmap Color Mode
Making a Bitmap Transparent
Using DesignCentral
Creating Bitmaps
Using the Bitmap Toolbar
Defining Marquees
Editing Bitmaps
Using Filters
Tracing Bitmaps