These fibers must run lengthwise along the fold, which influences the alignment, hence the position, of the pages on the printed sheet. Paper fiber direction: Many papers have a "grain," reflecting the alignment of the paper fibers.Stitching/binding method: The compositor must understand how the sheets are placed to form the signatures that compose the finished book.Number of pages of the printed product: The compositor must determine how many sheets are to be printed to create a finished book.Format of the product: The size of the finished page determines how many pages can be printed on a single sheet.Imposition is affected by five different parameters: To achieve this, the printed sheet must be filled as fully as possible. It consists in the arrangement of the printed product’s pages on the printer’s sheet, in order to obtain faster printing, simplified binding and reduced paper waste.Ĭorrect imposition minimizes printing time by maximizing the number of pages per impression, reducing cost of press time and materials. Imposition is one of the fundamental steps in the prepress printing process.
For the historical British taxes, see Impositions.
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