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Reference: The Tool Chest
Sampling the Image for Gray Point
The gray point can also be set by direct sampling. Sampling the
image leaves the selected pixel at its current brightness while
adjusting color balance by altering the gray point for each of the
component channels in the image.
To sample the gray point, click the button. When the cursor
is moved over the active image, it will take the shape of an eye-
dropper. Move the cursor over the image to find the pixel that
you want to use to set the gray point, keeping an eye on the
color value display in the Information palette to identify pixels
with a neutral input value (look for pixels that you think should
be a neutral gray color in the final image). With the cursor over
the target pixel, click the mouse button. The average of the
input values for each of the channels in the selected pixel will be
used as the reference value for the gray point. The cursor will
return to its original shape, and the image will automatically be
altered to reflect the new value for gray point (the weight as-
signed to each channel when determining the average value can
be set using the “Gray point target” option in the Advanced
Color tab of the Preferences dialog).
Pg. For more information on:
134 Preferences—Advanced Color
74


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