Select and Mask opens with the image. A semitransparent “onion skin” overlay indicates masked
areas, which are represented by a checkerboard pattern. For now, the checkerboard pattern
covers the entire image, because you haven’t yet identified the areas to unmask.
3. In the Options bar, click the Select Subject button (or choose Select > Subject).Tip
You don’t have to be in the Select and Mask dialog box to use the Select > Subject
command. It’s available even when a selection tool is not active. In addition, the Select
Subject button appears in the options bar when some selection tools are active.