Apple Aperture 3.5 - Manual (Page 292)

Chapter 7 Make image adjustments 292
2 To adjust the tonal curve of the red color channel, choose Red from the Channel pop-up menu,
place points on the curve, and adjust the points as necessary to remove or accentuate red and
cyan color casts.
For information about placing points on the curve, see “Manually adjust the tonal curve of an
image,” above.
You can adjust the red tonal curve in the following ways:
•
To add cyan to the shadows, removing red: Move the tonal curve down in the shadows.
•
To add red to the shadows, removing cyan: Move the tonal curve up in the shadows.
•
To add cyan to the midtones, removing red: Move the tonal curve down in the midtones.
•
To add red to the midtones, removing cyan: Move the tonal curve up in the midtones.
•
To add cyan to the highlights, removing red: Move the tonal curve down in the highlights.
•
To add red to the highlights, removing cyan: Move the tonal curve up in the highlights.
3 To adjust the tonal curve of the green color channel, choose Green from the Channel pop-up
menu, place points on the curve, and adjust the points as necessary to remove or accentuate
green and magenta color casts.
You can adjust the green tonal curve in the following ways:
•
To add magenta to the shadows, removing green: Move the tonal curve down in the shadows.
•
To add green to the shadows, removing magenta: Move the tonal curve up in the shadows.
•
To add magenta to the midtones, removing green: Move the tonal curve down in the midtones.
•
To add green to the midtones, removing magenta: Move the tonal curve up in the midtones.
•
To add magenta to the highlights, removing green: Move the tonal curve down in the highlights.
•
To add green to the highlights, removing magenta: Move the tonal curve up in the highlights.
4 To adjust the tonal curve of the blue color channel, choose Blue from the Channel pop-up menu,
place points on the curve, and adjust the points as necessary to remove or accentuate blue and
yellow color casts.
You can adjust the blue tonal curve in the following ways:
•
To add yellow to the shadows, removing blue: Move the tonal curve down in the shadows.
•
To add blue to the shadows, removing yellow: Move the tonal curve up in the shadows.
•
To add yellow to the midtones, removing blue: Move the tonal curve down in the midtones.
•
To add blue to the midtones, removing yellow: Move the tonal curve up in the midtones.
•
To add yellow to the highlights, removing blue: Move the tonal curve down in the highlights.
•
To add blue to the highlights, removing yellow: Move the tonal curve up in the highlights.
Preserve highlight and shadow details in an image
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
or 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.
You can also brush the Highlights & Shadows adjustment on specific areas of an image. For more
information, see
Apply brushed adjustments on page 228.
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