there is a problem,i used to select an area and paint inside directly.
but today in the middle of a project it become vice versa.when i select it paint outside
and i have to press ctrl+shift+i and it takes my time.
anyone do you knows how to change it back like paint direct inside?
Are you making selections with the Pen tool, by chance? Could be it was changed from Combine Shapes to Subtract Front Shape, which, when converted to a selection, will select everything outside of itself, which sounds like what you're describing. Just change it back to Combine Shapes and it should behave as expected.
It is easier to destroy than to create.
More fun, too.