Chapter 2 Making Image Adjustments 71
Setting the Tint of the Black, Gray, and White Values
in the Image
You use the Black, Gray, and White Tint color wheels when you want to selectively
remove color casts from the shadows, midtones, and highlights in the image. Color
casts are often caused by shooting in mixed lighting and unnatural lighting situations
where the difference in the color from the mixture of multiple types of source lights
can produce a color variance in a specific tonal range in an image. For example, when
shooting indoors, interior incandescent (tungsten) lighting can often produce a yellow
color cast through the white colors in the image. Using the White Tint eyedropper, you
can have Aperture isolate the highlights and add blue to the white values, thereby
reducing the yellow color cast and returning the whites to neutral white.
There are two methods for selectively adjusting the tint values in an image: you can
either use the Black, Gray, and White Tint eyedroppers to have Aperture automatically
adjust the tint to neutral color values, or you can use the Black, Gray, and White Tint
color wheels to manually adjust the tint values. The method you choose is determined
by the level of precision you require. The eyedroppers provide an accurate means of
identifying the color cast within the tonal range of each eyedropper and returning the
color values to neutral. However, depending on the subject, you may not want to
completely remove the color cast found in a specific tonal range. Therefore, you can
manually adjust the tint values in the shadows, midtones, and highlights using the
Black, Gray, and White Tint color wheels.
Using the Eyedroppers to Set the Tint of the Shadows, Midtones,
and Highlights in an Image
You use the Black, Gray, and White Tint eyedropper tools when you want to have
Aperture selectively modify the tints of the shadows, midtones, and highlights in an
image automatically. Whereas using the White Balance controls adjusts the tints of all
tonal values in the image uniformly, the Black, Gray, and White Tint eyedropper tools
allow you to selectively neutralize color casts that affect only the shadows, midtones,
or highlights. In some difficult cases, you can use the Black, Gray, and White Tint
eyedropper tools in combination with the White Balance controls to first neutralize a
tint in a specific tonal range, and then uniformly remove the tint from the rest of the
image. For more information about adjusting white balance, see “Working with the
White Balance Controls” on page 94.
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