Return image at next larger power of 2 reduction compared to what was requested.
Return image at next larger power of 2 reduction compared to what was requested.

niksu/bookreader,yankl/bookreader,brisandbeans/bookreader,internetarchive/bookreader,openlibrary/bookreader,Islandora/internet_archive_bookreader,yankl/bookreader,niksu/bookreader,gootdude/bookreader,garyrh/bookreader,nikolas/bookreader,brisandbeans/bookreader,niksu/bookreader,openlibrary/bookreader,gootdude/bookreader,gootdude/bookreader,openlibrary/bookreader,Islandora/internet_archive_bookreader,Islandora/internet_archive_bookreader,gootdude/bookreader,garyrh/bookreader,garyrh/bookreader,yankl/bookreader,internetarchive/bookreader,openlibrary/bookreader,Islandora/internet_archive_bookreader,brisandbeans/bookreader,yankl/bookreader,niksu/bookreader,garyrh/bookreader,openlibrary/bookreader,nikolas/bookreader,garyrh/bookreader,Islandora/internet_archive_bookreader,brisandbeans/bookreader,brisandbeans/bookreader,niksu/bookreader,yankl/bookreader