Measuring Actual Ambient Light
and Using PRE
This method allows you to measure ambient light values and
set the camera’s WB. It’s not hard to learn and is very
accurate since it’s an actual through-the-lens measurement of
the source light’s Kelvin temperature. You’ll need a white or
gray card to accomplish this measurement. Figure 10-3 shows
the popular WhiBal pocket card, which is a product of
PictureFlow LLC and is available exclusively from
RawWorkflow.com.
Figure 10-3. The WhiBal pocket card in its case
How to select the PRE White balance measurement method:
1. Press and hold the WB button.
2. Rotate the Main command dial until PRE shows in the
lower-right of the Control panel. You’ll also see d-0 in
the top-left corner of the Control panel (Figure 10-4).
3. Release the WB button.
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