HP DreamColor Z27x Studio Display User Manual download pdf (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:

<?xml version="1.0" encoding="ISO-8859-1"?>

<validate_flag value="FALSE"/>

<archive_lut_flag value="FALSE"/>

<target_primaries rx="0.640" ry="0.330" gx="0.300" gy="0.600" bx="0.150"

by="0.060" wx="0.4476" wy="0.4074" wY="150" external="TRUE"/>

<external_primaries rx="0.675" ry="0.315" gx="0.210" gy="0.705" bx="0.147"

by="0.054" wx="0.3129" wy="0.329"/>

</studiocal>

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:

<cr_set_lumlow+cr lumlow="FLOAT" cr="INTEGER">

<cr_set_lumlow+lumhigh lumlow="FLOAT" lumhigh="FLOAT">

• 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:

<user_settings operation="save|load"/>

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.

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HP DreamColor Z27x Studio Display User Manual Page 14

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