HP DreamColor Z27x Calibration Best Practices for the DreamColor Z27x Professi - Page 14

Technical white paper | Calibration Best Practices for the HP DreamColor Z27x Professional Display - Z7X230/Z7X240 Firmware Release The following is an example of an external measurements Studio Cal XML file: When a USB drive is inserted into one of the two DreamColor USB ports the display will read the StudioCal file. You can generate a new color space based on the external measurements. Once generated the new color space preset will be generated and the display will switch to that preset. Then, with that color space active, you can use the test pattern generator to measure and verify the generated primaries. Contrast Ratio Limiting In some workflows - on-screen newsprint, for example - it is desirable to have a contrast ratio lower than the display's native contrast ratio. The Z27x provides two different tags for this workflow. The two tags each have two arguments and are structured as follows: • lumlow: specifies the luminance value for 0% black • lumhigh: specifies the luminance value for 100% white • cr: specifies the desired contrast ratio Use the tag that best-matches your workflow. In each case, the LUTs will be calculated so that a lower contrast is achieved than would normally be the case. Display Settings Uploading and Downloading Though Studio Cal XML is designed for calibration-type functions, it is designed to be extended to support additional functionality in future firmware releases. New to the Z7X230 firmware release is a tag that allows you to export a Z27x display configuration to an XML file and then load that configuration back to the same display or deploy it to other displays. This tag was designed to facilitate the "configure, calibrate, and deploy" model used by many large VFX and animation studios. With this tag, IT can configure a single Z27x display so that all menus are configured as desired then deploy that configuration onto all other Z27x displays in the facility. As this command is not calibration-focused it cannot be used with calibration-specific tags. The tag contains two attributes and is structured as follows: The operation tag can be set to either "save" or "load." If set to "save" the display's configuration will be written to a file named "Z27X_UserSettings.xml" on the root of the attached USB drive. (If this file already exists on the drive it will be overwritten. Though this file is human-readable it is not designed to be manually edited and as a result the tag attributes are not documented. If an attribute has been changed to a value that is out of range that attribute will be skipped when being loaded into the display. If set to "load" the "Z27X_UserSettings.xml" file must be present on the inserted USB drive. It will then load the settings into the display, replacing all existing settings with the new settings. Color space presets, being calibration-based, are not affected by this command. 14