In an online collage-based editor, a method for determining an effective aspect ratio for a selected project orientation that includes a group of two or more available page sizes having different aspect ratios and displaying a project page at a derived aspect ratio in the GUI during editing includes the steps (a) determining for each page size in the group, the viewable area of each page, (b) recording the aspect ratios of the viewable areas of step (a), (c) using a mathematical function, describing a total amount of error present amongst the available aspect ratios of step (b) for a given aspect ratio, (d) using a mathematical program, process, or automated calculation tool, finding the effective aspect ratio that minimizes the function and hence the error value of step (c), and (e) displaying the project page at the selected effective aspect ratio.
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