You can also create a layout with a fold pattern. Fold patterns quickly create press-run sections with prenumbered page grids. The default or planned sheet and page size are automatically applied. If you use a fold pattern, you can adjust the trims to suit your needs.

Shingling (creep)

Creep in a book can cause content to be trimmed due to pages pushing out when the sections are folded. You compensate for creep by progressively shingling the page image areas towards the binding to decrease the page gutter or margin width, without affecting content. If you must maintain the gutter and margin widths, you can choose to progressively scale the images instead of shifting them.

The amount of creep in a book is affected by the number of folds and by paper thickness, and the affected pages depends on the binding style. In a saddle-stitched book, the increased thickness at the fold can cause the inside section to push out. In perfect-bound books, creep is limited to the inner pages in each individual section.

Bottling (rotation)

When an imposition section is folded, its pages might bottle (also known as skew) due to the number of pages, the thickness of the paper, or the folding equipment. You might also need to set or disable shingling for specific pages in a book.

To compensate for bottling, you rotate the pages in the opposite direction. You specify either a positive or negative degree of bottling:

• A positive amount rotates the pages counterclockwise relative to the head direction on the press sheet front.
• A negative amount rotates the pages clockwise on the press sheet front. The back side pages automatically rotate to line up with the front side pages.

Specify the degrees and the point around which to rotate the pages.

Creating an imposition

1. Close any open jobs in Preps.
2. In the Resources pane, click the Media list.
3. Double-click Press Sheet Size.
   The media is added to the workspace in the Press Runs view. 
4. Click the Stock panel.
5. Double-click 25 in x 38 in (B1) (metric: 635 mm x 965.2 mm).
   The stock is added to the workspace. 
6. Click the Marks list.
7. In the Tutorial group, double-click ColorBar.
   The color bar is added. 
   Note: If you know the fold pattern that you want to use, locate it in the Layouts pane and double-click it or drag it to the workspace. If you don't know which fold pattern is best, continue with the following steps.
8. Select Job > Create Imposition.
9. In the Resources pane, expand the Fold Pattern list and select JDF-F16-8.
10. In the Fold Flip list, select Yes.
11. In the Fold Rotation list, select 180 degrees.
12. In the Trims section, set the spine to 0.
13. Click OK.
    Note: If you need to make any changes to the layout (for example the trims), click the layout in the workspace and make the adjustments in the Section Properties pane. 
14. To save the layout as a template, follow the steps in Saving the layout as a template in the previous activity.