i would like to share a new method to realize georeferenced 2D-photomosaic. Thanks to the new version of OpenJump (r3856), now it is possible to export the GIS-view to any kind of resolution (no more block to 3800 width-pixel). Just set in the oj_linux.sh file (OpenJump bin folder) the allowed memory in the line 24
with 2048M my computer can export GIS-view till the value of 6905 width-pixel. More memory gives more resolution.
This is the videotutorial:
and this an example: