Apple Aperture 2 Manual do Utilizador descarregar pdf (Página 435)

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Chapter 15 Making Image Adjustments 435

III

Adjusting the Levels of the Blue Color Channel

You adjust the levels of the blue color channel when you want to remove blue and

yellow color casts in the image.

Working with the Highlights & Shadows Controls

You use the Highlights & Shadows adjustment controls to correct the exposure in images

shot in complex lighting conditions. For example, you can use the Highlights & Shadows

controls to correct the exposure of the darker areas (shadows) of an image that was

otherwise correctly exposed for silhouette. You can also use the Highlights & Shadows

controls to retrieve detail in extremely bright areas of an image. This is particularly useful

when adjusting images of clouds, snow, or images correctly exposed for the shadow areas.

Using the Highlights & Shadows controls is the best way to optimize your image’s

exposure in the highlights, midtones, or shadows without compromising detail in the

other areas of tonality.

Move Gray Levels slider right Adds magenta to the midtones, removing green.

Move White Levels slider left Adds green to the highlights, removing magenta.

Green adjustments Effect

Blue adjustments Effect

Move Black Levels slider right Adds yellow to the shadows, removing blue.

Move Gray Levels slider left Adds blue to the midtones, removing yellow.

Move Gray Levels slider right Adds yellow to the midtones, removing blue.

Move White Levels slider left Adds blue to the highlights, removing yellow.

Before Blue Levels adjustment

After Blue Levels adjustment

(moved White Levels and Gray Levels sliders left)

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