User Guide

ACDSee™ Pro User Guide
94
Adjusting brightness curves
You can use the Curves tool to change the tonal range of an image. Select the RGB color channel to
adjust the entire range of the image, or select a specific color.
You can save your options as a preset for future use.
To adjust the brightness curves in an image:
1 In Edit Mode, on the Edit panel, click Exposure, and then select the Curves tab.
2 On the Curves tab, set the options as described below.
3 Drag the histogram bar to manipulate the image.
4 Do one of the following:
•Click Apply to apply your changes and set options on another tab.
•Click Done to apply your changes and close the Curves tool.
•Click Cancel to discard all changes and close the tool.
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:
• Adjust Contrast: automatically analyzes and adjusts image contrast.
• Adjust Color and Contrast: automatically analyzes and adjusts each color
channel independently, and then adjusts the contrast.
• Adjust Color and Brightness: automatically analyzes and adjusts image
color and brightness.
• Tolera nce : opens the Tolerance settings dialog box. Specify the
maximum clipping percentage for Shadows and Highlights, and click
OK. ACDSee adjusts the image levels automatically.
Reset Discards all changes and reverts to the original image levels.