

Instead, with your selection still active, hold down Shift and click to create your desired new selection. If you realize you’ve missed a part of your image in your selection, you don’t have to start all over again. To do this, you can hold down Shift after placing your anchor point to constrain your angle.

But if you want to create a selection where each angle is the same at each point, or two lines run parallel, for example, you will need to constrain the angle at which your line leaves its anchor point. When using the polygonal lasso tool, you will be able to draw your new line in any direction once you have placed an anchor point down. Finished selection with the polygonal lasso tool. If you’re not happy with your selection and want to change it, press Control + D to deselect.

Once you’ve finished your selection, you will see the lines change and start to flicker – this means that your selection is active.
