HP DreamColor Z31x User Guide - Page 94

Making measurements with non-supported measurement equipment, Open Menu, Menu and Message Control

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● As only primary and white point measurements are made with the external instrument, a new luminance target cannot be iterated. Therefore, the existing luminance value for the preset you are recalibrating will be used. ● Existing calibration measurement data must be present on the display in order for gamma to be correctly calculated. In most cases, factory data or data from your most-recent calibration with a supported instrument will be sufficient. The attributes are identical to those in target_primaries. As with target_primaries, the use_uv tag is optional. Making measurements with non-supported measurement equipment To facilitate primary and white point measurements, HP recommends that you use the internal test pattern generator. This is because the internal test patterns are always displayed using the display's native gamut. The internal test patterns are not accessible by default, but one of the bezel button function keys can be set to display the pattern generator. To set a function key to the test pattern generator: 1. Press any bezel button to display the initial button labels, and then choose Open Menu to display the main menu. 2. Select Menu and Message Control. 3. Select Configure Function Buttons. 4. Select the desired function button to display the list of commands that can be mapped. 5. Select Test Pattern Generator to assign it to the function button. 6. Press Exit. Once you have mapped the test patterns to a bezel button, you can use that function to display the required patterns. Display the red, green, blue, and white test patterns, and measure them with your instrument. Record the xy or u'v' measurements into an tag in your Studio Cal XML file. Then enter the desired primaries and white point into a tag in the same file. The following is an example of an external measurements Studio Cal XML file: 84 Chapter 4 Using the StudioCal XML schema

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●
As only primary and white point measurements are made with the external instrument, a new luminance
target cannot be iterated. Therefore, the existing luminance value for the preset you are recalibrating
will be used.
●
Existing calibration measurement data must be present on the display in order for gamma to be
correctly calculated. In most cases, factory data or data from your most-recent calibration with a
supported instrument will be
sufficient.
<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"/>
The attributes are identical to those in target_primaries. As with target_primaries, the use_uv tag is optional.
Making measurements with non-supported measurement equipment
To facilitate primary and white point measurements, HP recommends that you use the internal test pattern
generator. This is because the internal test patterns are always displayed using the display's native gamut.
The internal test patterns are not accessible by default, but one of the bezel button function keys can be set
to display the pattern generator.
To set a function key to the test pattern generator:
1.
Press any bezel button to display the initial button labels, and then choose
Open Menu
to display the
main menu.
2.
Select
Menu and Message Control
.
3.
Select
Configure
Function Buttons
.
4.
Select the desired function button to display the list of commands that can be mapped.
5.
Select
Test Pattern Generator
to assign it to the function button.
6.
Press
Exit
.
Once you have mapped the test patterns to a bezel button, you can use that function to display the required
patterns. Display the red, green, blue, and white test patterns, and measure them with your instrument.
Record the xy or u’v’ measurements into an <external_primaries> tag in your Studio Cal XML
file.
Then enter
the desired primaries and white point into a <target_primaries> tag in the same
file.
The following is an example of an external measurements Studio Cal XML
file:
<?xml version="1.0" encoding="ISO-8859-1"?>
<studiocal>
<calibration entries="1">
<calibration_info>
<preset num="0" name="sRGB D65" store="user"/>
<gamma value="sRGB"/>
<target_primaries rx="0.640" ry="0.330" gx="0.300" gy="0.600"
bx="0.150" by="0.060" wx="0.3127" wy="0.329" wY="80"
external="FALSE"/>
<external_primaries rx="0.675" ry="0.315" gx="0.210" gy="0.705"
bx="0.147" by="0.054" wx="0.3129" wy="0.327"/>
</calibration_info>
84
Chapter 4
Using the StudioCal XML schema