Apple Aperture 2 - Manual (Page 346)

346 Part III Performing Image Adjustments
Monochrome Overlay Descriptions
The following table lists the monochrome overlays and the corresponding color
channels that have been clipped by the adjustment slider setting.
Using the Color Meter
Aperture provides a built-in Color meter you can use to sample the color values in an
image and display them as RGB, Lab, CMYK, HSL, or HSB values. When you place the
pointer over an image or thumbnail, the color values are displayed in the Adjustments
inspector or the Adjustments pane of the Inspector HUD. You can also use the Loupe
for a more accurate pixel selection and see the color values displayed within the
magnified area of the Loupe. When the pointer is moved away from the image, basic
EXIF data values about the image are displayed in place of the color values, such as ISO
setting, f-stop, shutter speed, and focal length.
Adjustment Color clipping information
Exposure slider
(Exposure adjustment controls) White: Indicates highlight clipping in all color channels.
66% Gray: Indicates highlight clipping in two color channels.
33% Gray: Indicates highlight clipping in one color channel.
Black: Indicates no highlight clipping in any color channel.
Recovery slider
(Exposure adjustment controls) White: Indicates highlight clipping in all color channels.
66% Gray: Indicates highlight clipping in two color channels.
33% Gray: Indicates highlight clipping in one color channel.
Black: Indicates no highlight clipping in any color channel.
Black Point slider
(Exposure adjustment controls) White: Indicates no shadow clipping in any color channel.
66% Gray: Indicates shadow clipping in one color channel.
33% Gray: Indicates shadow clipping in two color channels.
Black: Indicates shadow clipping in all three color channels.
Black Levels slider
(Levels adjustment controls) White: Indicates no shadow clipping in any color channel.
66% Gray: Indicates shadow clipping in one color channel.
33% Gray: Indicates shadow clipping in two color channels.
Black: Indicates shadow clipping in all three color channels.
White Levels slider
(Levels adjustment controls) White: Indicates highlight clipping in all color channels.
66% Gray: Indicates highlight clipping in two color channels.
33% Gray: Indicates highlight clipping in one color channel.
Black: Indicates no highlight clipping in any color channel.