You can convert ODG images to common BMP using OpenOffice based drawing programs or any of the available file conversion web services. However, the resulting file will be much larger, as BMP is not compressed.
Convert OpenDocument drawing to Standard Windows bitmap image.
We have found one software suitable in our database for this conversion.
Multiplatform software - convert odg to bmp on any platform
Graphic and diagram software from LibreOffice suite
Convert from odg file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.