Once you've made your selections, click the Compute button to create the initial mask. Then, you can use the other tools in the plug-in to further refine your mask, if necessary. As you work, you can choose to view your image in several ways:
Image – Selecting this option will show your original image.
Trimap – This view shows which portions of the photo were marked to keep and cut as well as the edges marked using the compute brush.
Mask – This selection shows the actual mask created by ReMask.
Keep – In this view, you can see the portion of the image that will be visible when the mask is applied to the photo.
Cut – This view shows the portion of the photo that will be hidden by the mask.