The quick mask mode can be used to neaten up edges of a selection for even more accurate cutting out of objects.
To use the quick mask mode, after selecting an area like shown above, you need to select the quick mask mode tool at the very bottom of the toolbar as shown below:
after selecting this the areas unselected will be highlighted in red.
you now need to select the eraser tool as shown below to 'rub out' the selected areas you wish not to be selected.
if you take too much off the selection you can swap round the colours at the bottom of the screen to add bits to the selection as shown below:
after your finished you need to select the quick mask mode tool again to get rid of the red and your selection will be shown inside a dotted line like so below:
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