P2P51
From ColorWiki
The P2P51 is an arrangement of colored patches designed for use with the G7 method of printer calibration.
The P2P51 supplants the earlier P2P25 target, and is the recommended chart to use at this time.
More information and download of the P2P51 is available here: http://hutchcolor.com/Images_and_targets.html
See also: