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Chapter 20 — Adjust Menu | Light > Levels & Curves 183
The Levels & Curves tool provides you with the following controls:
q Channel Selector
The channel selector lets you select which channel, or portion of colors, you want to affect. The default is to
edit all three channels, red, green, and blue, simultaneously. Click on this pull-down menu to select an
individual channel to edit.
w Curve Editor
The curve editor is where the majority of enhancements are made within the Levels & Curves tool. Within
the curve editor, you are presented with a histogram that presents the total luminosity values within your
image. Superimposed above this histogram, a curve is displayed that enables you to control the relationship
of input luminosity values to output luminosity values.
q
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t y u i o !0 !1 !2 !3
Shortcut
(while a Levels & Curves step is active):
RGB Channels: Ctrl + ~ (Windows)
command + ~ (Macintosh)
Red Channel: Ctrl + 1 (Windows)
command + 1 (Macintosh)
Green Channel:Ctrl + 2 (Windows)
command + 2 (Macintosh)
Blue Channel: Ctrl + 3 (Windows)
command + 3 (Macintosh)