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52 ADVANCED IMAGE PROCESSING
On the tone-curve / histogram palette, corrections can be
made by specifying a white, black, and gray point within the
image. Locating an appropriate neutral area within the
image is critical to correctly calibrate the software.When the
dropper tool is selected, the RGB display is active and can
be used to evaluate the image area. All changes are imme-
diately reflected in the displayed image.
WHITE, BLACK, AND GRAY-POINT
CORRECTIONS
Click the white-point button; the mouse point-
er changes to the white dropper tool.
Click the black-point button.
With the dropper tool, click on the brightest neutral area of
the image to define it as the white point.The values of the
image will be adjusted based on the selected point.The
default level for the white point is 255 for each RGB channel.
With the dropper tool, click on the darkest neutral area of the
image to define it as the black point.The values of the image
will be adjusted based on the selected point.The default level
for the black point is 0 for each RGB channel.