Apple Aperture 2 User Manual
Page 423
Chapter 15
Making Image Adjustments
423
III
There are two methods for selectively adjusting the tint values in an image: you can
either use the Black Tint, Gray Tint, and White Tint eyedroppers to have Aperture
automatically adjust the tint to neutral color values, or you can use the Black Tint, Gray
Tint, 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 Tint, Gray Tint, 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 Tint, Gray Tint, 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 Tint, Gray Tint, 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 Tint,
Gray Tint, 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
Correcting the Tint of the Shadows with the Black Tint Eyedropper
You use the Black Tint eyedropper to remove color casts from the shadows in your images.
Before Black Tint adjustment
After Black Tint adjustment