User Guide

Chapter 5: Editing
125
Levels options
Channel Specifies the brightness or color channel you want to adjust.
Shadows Specifies the blackpoint of an image.
Move the slider or type a number from 0 to 255 into the spin box to define
the blackest area of an image. As the value increases, the dark colored
areas of the image become darker.
Midtones Specifies the gamma correction in an image.
Move the slider or type a number from 0.00 to 2.00 into the spin box to set
the amount of gamma correction. Higher values make the image appear
brighter, while lower values make the image appear darker.
Highlights Specifies the whitepoint of an image.
Move the slider or type a number from 0 to 255 into the spin box to define
the whitest area of an image. As the value increases, the light colored areas
of the image become lighter.
Clipped % Indicates how much of the image detail is lost due to blackpoint and
whitepoint correction.
Shadows
picker
Click the Shadows picker and then click the image area you want to set as
the blackpoint.
Midtones
picker
Click the Midtones picker and then click the image area you want to set as
the gamma correction value.
Highlights
picker
Click the Highlights picker and then click the image area you want to set
as the whitepoint.
Auto Select one of the following options:
x Adjust Contrast: automatically analyzes and adjusts image contrast.
x Adjust Color and Contrast: automatically analyzes and adjusts each
color channel independently, and then adjusts the contrast.
x Adjust Color and Brightness: automatically analyzes and adjusts
image color and brightness.
x Tolerance: opens the Tolerance settings dialog box. Specify the
maximum clipping percentage for Shadows and Highlights, and click
OK. ACDSee adjusts the image levels automatically.
Exposure
warning
Highlights over- and under-exposed areas of the image.
Reset Discards all changes and reverts to the original image levels.