Canon FS 3.6 - Manual (Page 48)

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Histogram Tab of the Adjust Dialog
1. Click this button (white pointer tool).
The mouse pointer will change to an eyedropper.
2. Position the eyedropper over a highlight in the
preview image and click.
• If you are scanning negative film with the exposure adjustment set to
[Auto], the expected coloration may, depending upon the image, not turn
out as expected. In that case, reset the highlight settings using the
eyedropper tool (white pointer tool) in the histogram tab of the Adjust
dialog. In expert mode, display the Adjust dialog by clicking the [Image]
menu and selecting [Adjust], or click the [Adjust] button. (p. 58)