Apple Aperture 3.5 - Manual (Page 219)

Chapter 7 Make image adjustments 219
Quick Brush Function
Polarize (Multiply) Deepens the colors in brushed areas of an image by
specifically darkening the shadows and midtones
while preserving the highlights.
Intensify Contrast (Overlay) Corrects shadows that appear washed out in brushed
areas of an image by intensifying the contrast
between pure black and 50% gray.
Tint Shifts the tint in brushed areas of an image.
Contrast Applies additional contrast in brushed areas of
an image.
Saturation Saturates the colors in brushed areas of an image.
Definition Adds clarity and reduces haze in brushed areas of an
image without adding too much contrast.
Vibrancy Adds saturation to desaturated colors only in brushed
areas of an image. Skin tones aren’t affected.
Blur Blurs (softens) brushed areas of an image.
Sharpen Sharpens brushed areas of an image.
Halo Reduction Removes blue and purple fringes in brushed areas of
an image. Fringing is occasionally produced by certain
lenses when the image is overexposed.
Noise Reduction Removes digital noise in brushed areas of an image.
About making adjustments onscreen
Human eyes perceive color subjectively. It’s difficult to make objective changes to the colors in
an image because the brain is so advanced that it skews the perception of colors to make them
appear as natural as possible. For this reason, it’s essential that you create the best possible work
environment for performing color adjustments. Such an environment excludes extraneous colors
that have the potential to throw off your eye.
Before you begin making color adjustments to your images, it’s important to do the following:
•
Set your display to its highest-resolution setting. This will give you the best view of your image.
•
Practice good color management by calibrating your displays and printers and making sure
their profiles are up to date.
•
Reduce the ambient light in the room you’re working in to prevent the light from skewing
your perception of the colors on your screens, and set your displays to their brightest levels.
•
If possible, paint the walls in the room in which you perform detailed image adjustments a
neutral gray. Keep bright-colored objects to a minimum to ensure that the colors on your
screens are not altered by the color in the rest of the room.
67% resize factor