Secondary Color Correction Primer - The Art and Technique of Digital Color Correction - page 167

Some apps allow you to click on a color only with the eyedropper; others
allow you to drag over large areas to qualify multiple shades of a color.
Some of these eyedroppers sample only the precise pixel that is at the tip
of the eyedropper; others allow you to set a user preference of sampling
and averaging a 3 × 3 grid of pixels around the tip of the eyedropper or
even a 5 × 5 sample. Consult the users' manual for your application on
how the eyedropper works. (And stay on top of your application's cur-
rent way of doing things, as applications evolve and gain new abilities or
ways of doing things all the time.) Learn the options for the eyedropper
tool when creating qualiications. This topic is not about speciic button
pushes in specific applications, so I will not go into them here.
Let's try doing an old-school color vector qualification, so that if you're
in an application that doesn't have an eyedropper, you can get some-
thing accomplished. Also, learning to do it the hard way helps understand
exactly what's going on and makes doing it the easy way even easier.
Load the “art_institute_lion_proper” clip into your color correction
application. I'll be using Color for this secondary tutorial. In Color, you
go to the Secondaries Room (which is like a tab) and enable one of the
secondary tabs just above the timeline (there are eight). Apple Color pro-
cesses each of theses secondary tabs in numerical order, so some colorists
like to leave the first secondary tab free in case they want to go back in
and stick a secondary in before their first secondary. If that sounds like
smart advice to you, select the tab for Secondary 2.
Fig. 5.9