Blackmagic Design DaVinci Resolve Studio (Dongle) - Manual (Page 386)

371
Selecting areas with Qualifiers
As you can see, the selection is not very clean. There’s a variety of ways to improve it.
The first will be to add additional samples of the color into the qualifier palette.
TIP You can change how your selection is presented using the three icons in
the upper-right corner of the viewer. Next to the standard grayscale highlight
icon, you also have the highlight B/W icon that outputs your image as a
black-and-white matte. This might be familiar to users who have previously
used compositing programs and have experience with keying.
7 Click the add color range button located in the Selection Range of the palette.
The add color range button allows you to append additional colors to the currently
selected range.