Imagenation is an imaging program that allows you to view raster images, vector images, and text documents. Depending on your edition of Imagenation, you can also mark up and clean images.
Documents are the totality of what is displayed in an Imagenation or an external document window, whether that be a single layer or several sections of embedded multipages containing multilayer pages.
Rasters, vectors, and text documents are displayed on layers in Imagenation. Rasters are displayed on raster layers. Vector images and text documents are displayed on edit layers. In some CAD files (for example, DGN and DWG), edit layers can be further subdivided. These sub-layers are called CAD layers.
Think of layers as sheets of acetate that can be stacked one on top of the other so that the information on each layer is displayed at once. This association of layers is called a page.
Pages, in turn, can also be combined. A group of associated pages (made up of single or stacked layers) is called a multipage document. Pages in multipage documents are normally displayed one at a time.
Complex multipage document containing one embedded multipage
A multipage can also contain other multipage documents embedded within it at a lower level, as demonstrated in the figure. In these cases you might think of it as a document that contains sections (embedded multipages), with sections that contain pages, with pages that contain layers and, in the case of CAD files, with edit layers that contain sub-layers. The foundation of the entire document structure is called the root.
See also