GRAPHICAL USER INTERFACE PRESENTING A UNIFIED VIEW OF A MAIN DOCUMENT IMAGE AND THUMBNAIL IMAGES

A GUI for displaying a main document image and multiple thumbnail images in a more space-efficient manner. One unified pane displays both a page of the document as a main image and multiple thumbnail images each corresponding to a document page. At least some of the thumbnail images overlap with the main image, with the main image displayed either as a transparent image (transparent display mode) or a solid image (solid display mode) in front of the overlapped thumbnail images. When a user selects a thumbnail image, the corresponding document page is displayed in the main image. The use may switch between the two display modes. In the transparent display mode, overlapped thumbnail images are visible and selectable, and the main image is not editable. In the solid display mode, overlapped thumbnail images are not visible and not selectable, and the main image is editable.