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dispcalGUI is a graphical user interface for the display calibration and profiling tools of Argyll CMS, an open source color management system by Graeme Gill.

Calibrate and characterize your display devices using one of the many supported hardware sensors, with support for multi-display setups and a variety of available settings like customizable whitepoint, luminance, black level, tone response curve as well as the option to create matrix and look-up-table ICC profiles, with optional gamut mapping. Other features include:

Support of colorimeter correction for wide-gamut screens via correction matrices or calibration specral sample files (the latter only for specific colorimeters i.e. i1 Display Pro, ColorMunki Display and Spyder 4).
Profile verification: Check the quality of profiles via measurements. Also supports custom CGATS files (e.g. FOGRA, GRACoL/IDEAlliance, SWOP) and using of reference profiles to obtain test values.
Test chart editor: Create charts with any amount of color patches, easy copy & paste from CGATS, CSV files (only tab-delimited) and spreadsheet applications.