1. A method for identifying a blur profile of a multi image display with a first image separating mask, comprising: a) displaying a calibration pattern through a second image separating mask; b) allowing a human observer to provide a visual estimation indicating a blur brought about to said calibration pattern by said second image separating mask; and c) generating a blur profile of at least said first image separating mask according to said visual estimation; wherein said first and second image separating masks having a substantially similar optical profile.