Apple Aperture 2 - Manual (Page 345)

Chapter 14 An Overview of Image Adjustments 345
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Black Point slider
(Exposure adjustment controls) Red: Indicates shadow clipping in the red color channel.
Green: Indicates shadow clipping in the green color channel.
Blue: Indicates shadow clipping in the blue color channel.
Yellow: Indicates shadow clipping in the red and green
color channels.
Pink: Indicates shadow clipping in the red and blue color channels.
Cyan: Indicates shadow clipping in the blue and green
color channels.
White: Indicates no shadow clipping in any color channel.
Black: Indicates shadow clipping in all three color channels.
Black Levels slider
(Levels adjustment controls) Red: Indicates shadow clipping in the red color channel.
Green: Indicates shadow clipping in the green color channel.
Blue: Indicates shadow clipping in the blue color channel.
Yellow: Indicates shadow clipping in the red and green color
channels.
Pink: Indicates shadow clipping in the red and blue color channels.
Cyan: Indicates shadow clipping in the blue and green
color channels.
White: Indicates no shadow clipping in any color channel.
Black: Indicates shadow clipping in all three color channels.
White Levels slider
(Levels adjustment controls) Red: Indicates highlight clipping in the red color channel.
Green: Indicates highlight clipping in the green color channel.
Blue: Indicates highlight clipping in the blue color channel.
Yellow: Indicates highlight clipping in the red and green
color channels.
Pink: Indicates highlight clipping in the red and blue color channels.
Cyan: Indicates highlight clipping in the blue and green
color channels.
White: Indicates highlight clipping in all three color channels.
Black: Indicates no highlight clipping in any color channel.
Adjustment Color clipping information