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The software and on-unit menu screen top out at 600 dpi, but this machine is supposed to be capable of much higher.Do I just need better software (and if so can you recommend something that would work) or is there just something I missed along the wa...

I just got a Canon Pixma MX922 All-In-One printer/scanner and am trying to do high res scans and prints.The bundled software and on-screen menu options top out at 600dpi, but the unit is advertised to have much higher capability. Is there something I...