Customer has some files provided by a third party vendor. They are unable to insert these images into GeoMedia using the 'GeoTIFF' placement option. They ask the criteria we use to determine whether a file is valid GeoTIFF or not.
The GeoTIFF standard was extensively documented at the web site www.remotesensing.org'. This web site is no longer maintained, the pages are now hosted by www.OSGeo.org. Specifically, the webpage http://trac.osgeo.org/geotiff/ is the go-to site for questions on how a GeoTIFF file is created. Please review the examples and information on coordinate systems and projections.