GPC is used just like another image vizualisation program, called 'GQView'. There are two lists on the left of the main window ; the first one displays every film stored in the current PostgreSQL database ; when you select a film, the second one displays images stored in the directory corresponding to the selected film.
Two little windows can display informations relatives to the current film and the current image.
The GPC main window is constructed like many other GNOME applications, with a menu bar and a toolbar displaying buttons. These toolbars can be moved to different places by using a 'handle' placed on the left of the bars.
The main area of the GPC window is composed of two lists, and a visualization area containing a notebook with two tabs named "Thumbnails" and "Image" :
the "Films" list displays the complete list of films stored in the PostgreSQL database where the connection is active. When in 'Query mode', the list only displays films corresponding to query parameters.
when a film is selected, the "Images" list displays all the images stored in the film's directory ; all the images contained in the selected film are also displayed as thumbnails in the visualization area.
when an image is selected from the list, the picture is displayed in the "Image" tab of the visualization area ; if the "Image Informations Window" is also visible, these informations are automatically updated. The zoom factor used by default when the image is selected can be defined in the 'Preferences' dialog ; the picture can then be zoomed in and out with buttons placed on the toolbar.
when an image is selected by clicking on a thumbnail, the picture is selected and displayed in the same way ; if the image is selected from a thumbnail by a double click, visualization area is switched automatically to the "Image" tab.
In each area, a contextual menu can be displayed by clicking the right button of the mouse, to execute commands faster.