http://web.media.mit.edu/~hangzhao/modulo.html

When a pixel fills up, it is automatically emptied. The camera counts
the number of times a pixel is emptied. Pixels in the darker image areas
probably never completely fill up.

--
Alfred Molon

Olympus E-series DSLRs and micro 4/3 forum at
http://tech.groups.yahoo.com/group/MyOlympus/
http://myolympus.org/ photo sharing site