Konica Minolta DiMAGE Scan Dual III AF-2840 - Manual (Page 79)

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The white and black-point values are set to 255 and 0 for each RGB level. Changing these values
allow the calibration of an image with no true white or black.
Double-click on either the white-point or black-point button to
activate the point-value-setting dialog box.
Enter the new white-point or black-point values. Click OK.
With the point-value-setting dialog box open, the mouse
pointer can be used to measure the color of any point on
the displayed image. The RGB display shows the original
values for the image on the left and the current values for
the image on the right.
Calibrate the image as described in the white, black, and gray point corrections section.
Setting the white and black-point values
Selective-color correction is an advanced technique to refine the colors in the image. A cyan,
magenta, yellow, and black channel can be used to adjust the six separate color groups in the
image: red, green, blue, cyan, magenta, and yellow. The black-level slider controls the brightness
of the selected color group.This type of correction is effective in changing a specific color without
influencing any of the other colors in the image. For example, if the sky looks purplish instead of
blue, magenta can be reduced in the blue color group. See page 2 for a selective-color example.
Selective-color palette
Drag a slider or enter a value in a text box to adjust the
selected color group. More than one slider can be used to
adjust the selected color. Changes will be reflected in the
display image. Click the reset button to cancel any changes.
Select the color group to be corrected from the drop-down
menu at the top of the window.
Click the selective-color button to open the
palette.