SUMMARY
Lightroom Classic's masking tools utilize AI subject recognition alongside brush and gradient options for detailed local adjustments. Users can enhance control by combining masks, referred to as 'sub-masks'. This technique is useful for scenarios like progressively darkening a sky without affecting foreground objects. For instance, intersecting a sky mask with a linear gradient mask allows for a gradual tonal adjustment that is confined only to the sky area.
TAKEAWAYS
Lightroom Classic masking tools combine AI and manual brushes/gradients for local adjustments.
Sub-masks allow for combining or editing existing masks for greater control.
Intersecting a sky mask with a linear gradient can darken skies progressively without affecting foreground objects.
Adjustment tools apply to the main mask; sub-masks define the area affected.