Graphics Programs Reference
In-Depth Information
enables you to see factually whether an image
is taking advantage of the complete tonal
range or whether it's lost a lot of information
in the highlights or shadows, and more. A
complete discussion of histograms is beyond
the scope of this book
To specify the type of histogram you want
Aperture to display on the top of the
Adjustments Inspector, do the following:
1.
Select an image, and then choose the
Adjustments Inspector.
2.
Click the Action pop-up menu
beneath and to the right of the histo-
gram, as shown in Figure 6.7.
3.
From the pop-up list, scroll to the
bottom and choose the type histo-
gram you prefer.
We prefer to use an
RGB histogram for the overall image his-
togram because it provides the most
information.
6.7
Choose the type of histogram to appear in
the Adjustments Inspector.
When making a Curves adjustment you can choose a different type histogram to
appear superimposed on the curve by going to the Action pop-up menu in the
Curves brick. In Levels, you can choose RGB or Luminance from the Channel pop-up
menu to control the type of histogram that appears in the dialog.
Genius
Commonalities of all the adjustment bricks
No matter which type adjustment you use, they share some common features, as shown in Figure 6.8.
Disclosure triangle.
Use this to expose or hide the settings for each adjustment. We
normally leave the adjustments exposed but that means we have to scroll through them;
hiding the controls means less scrolling. That's strictly a personal preference.
Check box.
When selected, the adjustment is applied to the image. To see the image
without the effect, deselect this box. It's an easy way to be sure you're heading in the
right direction with your improvements, then toggle it back on again. All sliders can be
continuously readjusted.
