You may set this property to three types of object:
1) GrapeCity.Documents.Drawing.Image objects.
2) Strings containing image file names or Urls.
3) Strings containing names of image fields in the report data source.
Options 1 and 2 are used to create unbound images, such as logos. These images do not depend on the report data.
Option 3 is used to create bound images, such as product or employee pictures. These are images stored with the report data.
