I've had the same problem as you and I found a solution.
Picasa stars are written in the .picasa.ini file, for each directory in the picasa albums.
I wrote a python script that processes the .picasa.ini in a directory, finds the starred images, and writes a "5 stars" Exif metadata to the corresponding files :
picasaStarsToExif.pyUse it as following :
picasaStarsToExif.py directoryContainingPicasaIni
You will need the python module pyexiv2 to run it. (sudo apt-get install python-pyexiv2)
It only supports JPG and jpg extensions, but you can easily modify the script to support other extensions.
Digikam imports this metadata to its own database for new images. For images already in your digikam collection, you need to use the option "re-read metadata from the image" in the album or image menu.
To apply the script recursively in all subdirectories of your image collection, you may run (from the top of your collection) :
find . -type d -exec [scriptLocation]/picasaStarsToExif.py {} \;
After that, you need to re-read metadata from all images in Digikam. The simplest and fastest way I've found to do that is to use the search tool of Digikam to find "everything". I've searched for the keyword "JPG", then selected all photos, then used the option to re-read metadata from selected images (image menu). Then, the same for the "jpg" keyword. (All my images have a "JPG" or "jpg" extension.) If your collection is big, it takes a while (and may freeze digikam), but once done, all your picasa stars have been converted to 5 stars in Digikam !
Hope this helps.
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