Simple imposition - available methods
This article describes the different simple imposition features available in pdfToolbox, and gives an overview of what you can do with them. How you can use them manually or automatically is described in the previous article. Keep in mind that not all parameters described in this article are necessarily available everywhere you can use this functionality. The Switchboard, for example, provides a simplified version of the functionality.
Booklet
This imposition method prepares an incoming PDF file for double-sided printing. Essentially, this method expects a PDF file with single pages (not spreads). It then creates imposition sheets that have two pages on each sheet. The pages are ordered on the imposed sheets in such a way, that all imposed sheets can be printed, and then folded to form a booklet. If your incoming PDF file doesn't have single pages, but spreads, you can use the "Split in half" imposition method to separate them into single pages first.
The imposition can be done either on a specific sheet size, or on the minimal sheet size possible for your input document. Additional parameters allow specifying an offset (this determines the distance from the left bottom corner and the imposed pages), whether you want trim marks, and the width of the bleed and border area. Shingling settings allow adjusting for the paper thickness while folding (there is a dedicated article about shingling, also called creep).
Fill page
Fill page expects a multi-page PDF file as input document. It then creates imposed sheets of the size specified, and fills each imposed sheet with as many pages from the input document as possible. The way this is done is not full sheet optimization; essentially it creates a grid (with the size of each element of the grid determined by the biggest page in the incoming PDF file) and flows PDF pages into this grid until all pages have been positioned. Pages are not rotated nor scaled to place them on the imposed sheets.
Additional parameters allow specifying how much bleed each placed PDF file should show (bleed is not created, but clipped at the size specified, and how much space there should be between placed pages. Placing cut marks is also possible.
Fill page (repeat)
Even though it has "Fill page" in its name, this imposition method is closer to "Step and repeat". Where in the step and repeat method, you have to specify how many rows and columns you want, this imposition method calculates the maximum number of rows and columns that will fit the imposed sheet.
The parameters are the same as for "Fill page": the size of the imposed sheet, how much bleed each placed PDF file should show (bleed is not created, but clipped at the size specified, and how much space there should be between placed pages. Placing cut marks is also possible.
N-up
The N-up imposition method expects a multi-page PDF input file. It then places different pages from the input file sequentially in a grid pattern, where you specify the number of rows and columns.
The imposition can be done either on a specific sheet size, or on the minimal sheet size possible for your input document. Additional parameters allow specifying an offset (this determines the distance from the left bottom corner and the imposed pages), whether you want trim marks, and the width of the bleed and border area.
Reader spreads
Reader spreads expects a PDF file with single pages (as opposed to spreads consisting of two pages on one sheet). The imposition method combines two single pages into a spread without reordering the pages. Optionally, the first page can be handled as a cover page and left as a single page. This means:
- Without the cover page option, page 1 and 2 are combined, then page 3 and 4, and so on.
- With the cover page option, page 1 remains a single page, page 2 and 3 are combined, page 4 and 5, and so on.
The imposition can be done either on a specific sheet size, or on the minimal sheet size possible for your input document. left bottom corner and the imposed pages).
Split in half
Sometimes, when you have a document that was exported with reader spreads (meaning, two pages are placed on each imposed sheet), you need single pages instead. Examples would be if you wanted to format the document as a booklet, or use it in an online PDF viewer, or... This imposition method does exactly that. It assumes your document was exported as reader spreads, and has 2 pages on each sheet.
The imposition method cuts each page in two to give you single pages again. If your document also contains single pages (perhaps the first page is a cover page), the single pages are not cut in half.
Step and Repeat
This imposition method creates one imposed sheet for each page of the incoming PDF file. On this imposed sheet, it places copies of that page in a grid-like fashion depending on the amount of rows and columns you specify. So an incoming 3-page PDF file gives rise to a 3-page imposed PDF file, where page 1 contains multiple copies of page 1 of the incoming file, and so on.
The imposition can be done either on a specific sheet size, or on the minimal sheet size possible for your input document. Additional parameters allow specifying an offset (this determines the distance from the left bottom corner and the imposed pages), whether you want trim marks, and the width of the bleed and border area.