Spectral tools - ISO 3664 (Color monitors)

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Based on the "Color monitors" viewing conditions defined in ISO 3664, this tool is designed to rapidly characterize your monitor "Brightness", "Chromaticity" and "Brightness uniformity". In the screenshot above, the center position is selected in the Brightness uniformity section; the absolute brightness at this position is 97 cd/m² with a 5771 K color temperature, and the chromaticity offset is 0,004, within the target goal. The relative brightness (in %) is shown relative to the center position (the maximum is usually the center position). By selecting another position, you could see this other position's absolute "Brightness", "Meas. Temp." (Color temperature) and "Meas. offset" (chromaticity offset). Selecting "Export to file" would provide additional data such as the chromaticity coordinates at each position (not just the offset).

These tools are called ISO 3664 with a "+" to indicate that alternate reference illuminants can be selected by the user for each test. For example, while ISO 3664 calls for a D65 target center for monitors, many would prefer using a D50 target, as recommended in ISO 12646 (Graphic technology -- Displays for colour proofing -- Characteristics and viewing conditions); to do so, simply select D50 in the "Target center" popup menu.

In our example, we selected D60 as the chromaticity target because this was the white point used to calibrate our display many weeks before doing this check (we notice that the White Point has drifted since). We used the "Take all" button to rapidly measure the nine targets, which are displayed one by one at the locations specified by ISO 12646. We see that this display, an average LCD display from a reputable vendor, fails the ISO 12646 requirements in terms of brightness uniformity.

You can also open an image of the nine targets and measure them manually; this is helpful when you want to measure the characteristics of a monitor not connected to the computer on which BabelColor CT&A is installed. Shown below, in reduced size, is such a target; similar targets are available in three image formats and for most popular screen resolutions in a folder named "ISO12646_targets" located in the BabelColor CT&A application folder.

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Last modification : 28 July 2008