how can i understand if they used Optical keystone correction or Digital keystone correction?
i read that
Optical keystone correction adjusts the image proportions by physically modifying the light-path through the lens system. The correction happens after the light has been reflected off (passed through) the image panel(s) in the projector, hence the full panel remain in use - there is no loss of resolution.
Digital keystone correction adjusts the image proportions by...