Have your tried with the newer "Gutenprint" driver?  This is the package
cupsys-driver-gutenprint (in dapper and edgy only).  It has much
improved colour quality.

The escputil tool will let you print a test pattern out to check for
blocked nozzles in the printhead.  It will also do head alignment and
cleaning.

Spurious characters printing indicate a bad printer connection, e.g.
intermittent connection in the parallel port contacts or a broken wire.

-- 
High quality photo printing broken
https://launchpad.net/bugs/29696

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