HP 5400c Series - Manual (Page 85)

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Viewing RGB values and pixel color
You can view the RGB values and pixel color for any spot in an image,
color or grayscale, using the RGB Meter.
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1 On the Advanced menu, click Adjust Exposure.
2 Move the cursor over the area in the item for which you want to see
the values. The values appear in the RGB area. A line appears in
the histogram to show you where those pixels occur.