pacsDisplay current version 5E


Open source software for generating and installing DICOM grayscale LUTS, and for performing QC on calibrated displays.

Download for Windows (.zip)

Access Source Code (Tcl)

How-to Videos


The applications in this software package include programs for generating and installing DICOM grayscale look up tables (LUTs), a program to display a grayscale quality control test patterns, and features to perform QC evaluations of calibrated displays. The present package release supports Microsoft Windows XP (32 bit), Windows 7 (32 and 64 bit), and Windows 10.

For display calibration, look up tables (LUTs) intended for the make and model of displays used on your workstation need to be specified. The package distribution includes a LUT-Library with generic LUTs for various display models. This library is commonly searched to retrieve the required LUT. For display models that are not in the library, a gray palette needs to be obtained using a supported photometer. A LUT is then generated from the measured palette and a configuration file is edited.

For QC measures, the essential tools are distributed in a folder that does not require installation. Typically this folder will be accessed from a USB memory device or network storage where a menu application is executed to select the desired application.

OS Support

Package Release 5D now provides support for installation and use on Microsoft Windows 10 operating systems. The location of the LUT-Library and configuration files that need to be edited has been changed to the C:/Users/Public folder to conform with the current Microsoft policy regarding files installed in the Program Files folder.

New Features

The X-Rite iOne Display Pro is now the recommended device for use with pacsDisplay programs. For this meter, color coordinates are now routinely obtained for all luminance measures. The i1meter application has been added to reports both illuminance and luminance as well as color coordinates. The meter application allows measurement of both illuminance and luminance. For quick QC validation of gray scale calibration with lumResponse, the white point color coordinates are now measured and gray tracking is reported along with GSDF conformance.

Version 5E updates the gtest and iQC software and adds the ambtest program to the pdQC toolset. The gtest program is now resizeable for full-display assessment. The iQC program is updated with three sizes of the AAPM Report 270 QC test patterns (sQC and pQC). The ambtest software displays a mostly-black window with a small, low-contrast test object for a user to identify. If the object is not seen, the user may want to recalibrate their display or adjust the ambient lighting. The contrast of the object is adjustable through key bindings.

Open Source

The development of pacsDisplay applications began in 2002. The first public package, Release 3H, was organized in 2006 and made available on request under the Gnu general public license. Since then, Henry Ford Health System has made use of the programs for enterprise PACS workstation and within radiology. Beginning with Package Release 5A, a more formal Open Source Project effort is being formed with software distributed from an Open Source repository at GitHub. The project roadmap includes new features for color calibration and ICC profiles.

Several tools in the current version use the spotread command line tool from ArgyllCMS to interface with photometers. If you have a meter supported by ArgyllCMS and would like to see it supported in pacsDisplay, please contact us. The authors of pacsDisplay are grateful to ArgyllCMS for the continued development of its product. If you find pacsDisplay helpful for your work, please consider supporting ArgyllCMS.

Authors and Contributors

This work was originally developed by Michael Flynn (@mflynn57). Nicholas Bevins (@nickbevins) is a contributing developer and has taken responsiblity for future updates and maintenance. Philip Tchou is a contributing developer.

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