Selections and masks are subtly different, and the ‘parametric’ masks in non-destructive editors give more flexibility than ever.
An image mask that transitions from clear to opaque gradually using a soft gradient. It could be used to darken a bright sky in a landscape shot, for example, without producing a hard edge where the adjustment takes effect.
‘Local adjustments’ is a bit of a catch-all term. It means picking out an area of an image for adjustment while leaving the rest unchanged. So how do local adjustments work and which software does them best?