Blur: The limit comparison is reduced.
Sharpen: Add a dot.
Smudge: Pixel offset.
Deepening: increased saturation and reduced brightness. Exposure refers to intensity. The range generally selects the middle tune. Add a shadow.
Dodge: decrease saturation and increase brightness. Exposure refers to intensity. The range generally selects the middle tune. Add highlights.
Sponge: Does not change the high light and dark tone, increase or decrease the saturation.
Deepening dodge can be used to do some stereoscopic effects.
PS in masks: layer masks, clipping masks, quick masks, vector masks, color band blending is also a masking principle.
Quick Mask Q requires a combination of brushes, and the selected area is the excluded area, and the effect is to produce a selection.
Layer Masks: Use black and white gray to mask the layer, black transparent. Mouse double-click the Layer Mask Pop-up properties panel to change the concentration and feathering.
Vector Masks: Low usage, must be used with pens and shapes, no effect.
Clipping mask: shaded bottom shape.