Operation Manual

• Range pop-up menu: Choose a viewing range option from this pop-up menu. Choosing
Shadows restricts the view of the histogram and tonal curve from pure black to 50
percent gray. Choosing Normal presents the view of the histogram and tonal curve
from pure black to pure white. Choosing Extended enlarges the view of the histogram
from pure black to two times pure white. Because some cameras are capable of
capturing image information beyond pure white, using the Extended range option
provides controls for bringing that information into the viewable image.
Working with the Auto Curves Buttons
You use the Auto Curves buttons to analyze the image and apply a tonal curve adjustment
to the image based on that analysis. This is a good way to make a quick correction to an
image before fine-tuning the Curves adjustment with the manual adjustment controls.
Using the Auto Curves Combined Button to Adjust Combined Luminance
When you want to quickly adjust the tonal curve of an image based on total luminance
values—red, green, and blue channels combined—you click the Auto Curves Combined
button. Red, green, and blue channels are adjusted by the same amount based on the
total luminance. You use the Auto Curves Combined button for luminance when you
want to correct the contrast of the image without modifying the color cast of the image.
Before Auto Curves Combined adjustment After Auto Curves Combined adjustment
To automatically adjust the tonal curve of an image based on total luminance
1 Select an image.
2 If the Curves controls are not shown in the Adjustments inspector or the Adjustments
pane of the Inspector HUD, choose Curves from the Adjustments pop-up menu.
540 Chapter 17 Making Image Adjustments