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Boolean operations on selections Definitely nerd stuff.
Play with selections using layers
Let: A = existing selection B = current layer area
Layer options pop-up
Select Replaces any existing selection with current layer area. Equals "regular " selection of the layer.
Add Adds current layer area to existing selection.
Boolean options submenu
Subtract (A – B) Subtracts current layer area from the existing selection.
Reverse subtract (B – A) Subtracts the existing selection from current layer are.
Note that the Boolean options are only accessible when a selection exist
Intersect Finds common area of existing selection and current layer area.
Note that you can use any Selection tool in two basic Boolean modes: normal (Add) Subtract
Difference Finds areas that are not common in existing selection and current layer area.
Toggle them on the Selection toolbar (page 299)
Pro tip: make a selection. Fill it with flat color on a separate layer. Repeat with other selections. Use these layers in various Boolean combinations to create any shape you need.
Infinite Painter’s Manual
ref: manual_editing_selections_boolean
Editing Tools • Selections • Page 318
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