Apple AppleVision monitors (OS 7.1) - Manual (Page 60)

4 Point to the color you want to measure.
Use the magnified view in the DigitalColor Meter window to help you
position the pointer.
The rectangular box below the numbers in DigitalColor Meter represents the
average color of the aperture area. This is the color that DigitalColor Meter
will measure.
5 When the pointer is positioned, press
x
-H on your keyboard.
This holds the color you’re pointing to. After you press the keys, you can
move the pointer and DigitalColor Meter will remember the held color.
Be careful not to click the mouse before you press the keys. If you do,
DigitalColor Meter won’t be the active application and the color won’t
be held.
6 Click a button to display the values for the held color using the selected color space.
Note: To display RGB values as percentages or pixel values, use the Meter
menu to select the appropriate option.
7 Select Copy from the Edit menu to put the current values on the clipboard, if desired.
If you want to measure another color, press
x-H again to release the currently
held color.
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