Patent ID: RE42089

Claim:
An apparatus for calibrating a display associated with stored Lookup Tables, including: first means for displaying on said display a first midtone sub-target having a first midtone solid adjacent to a first midtone blended region, said first midtone blended region having a first series of adjacent double rows of substantially black pixels alternating with a first series of single rows of light pixels; second means for displaying on said display a second dark sub-target having a second dark solid adjacent to a second dark blended region, said second dark blended region having a second series of adjacent double rows of substantially black pixels alternating with a second series of single rows of midtone pixels; third means for displaying on said display a third light sub-target having a third light solid adjacent to a third fight blended region, said third light blended region having a third series of single rows of substantially black pixels alternating with a third series of single rows of midtone pixels and alternating with a third series of single rows of light pixels; and means for modifying said Lookup Tables responsive to changes in said first, second and third sub-targets.