Exporting Large Diagrams as Image
For large diagrams it is not recommended to export to BMP,GIF or JPEG. When exporting to BMP,GIF or JPEG, a bitmap is created first. The size of a bitmap is limited and differs per OS version.
Use Windows Meta File in case you want to export a large diagram. Meta Files are much smaller files because it is a vector based file format.
See also: Export an image of the data model