Calibration targets are needed to do scanner and camera profiling.
Richard Hughes
richard@hughsie.com

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# Which target types are supported?

The following types of targets are supported:

CMP DigitalTarget

ColorChecker 24

ColorChecker DC

ColorChecker SG

i1 RGB Scan 14

LaserSoft DC Pro

QPcard 201

IT8.7/2

You can purchase targets from well-known vendors like KODAK, X-Rite and LaserSoft in various online shops.

Alternatively you can buy targets from Wolf Faust at a very fair price.