When an offset printed document uses more than one ink on the same page, each ink must be printed in register (perfectly aligned) with any other inks that it abuts, so that there is no gap where the different inks meet. However, it’s impossible to ensure exact registration for every object on every sheet of paper running through a printing press, so misregistration of inks can occur. Misregistration causes an unintended gap between inks. You can compensate for misregistration by slightly expanding one object so that it overlaps an object of a different color—a process known as trapping. By default, placing one ink over another knocks out, or removes, any inks underneath to prevent unwanted color mixing; but trapping requires that inks overprint, or print on top of each other, so that at least a partial overlap is achieved.

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Avoid the need for trapping by eliminating the possibility of misregistration in your use of color. Prevent misregistration by making sure that abutting process colors have common inks. Black Magic 2 1976.

For example, if you specify a dark purple stroke with a vivid red fill, they will both contain a significant percentage of magenta. The stroke’s and fill’s common magenta will print as a single area, so that if misregistration occurs in the other process inks, the magenta printing plate will make any resulting gap hard to see. InDesign can trap color documents with its built‑in trapping engine, and can also take advantage of the Adobe In‑RIP Trapping engine available on Adobe PostScript output devices that support Adobe In‑RIP Trapping.

Both trapping engines calculate adjustments to the edges of both type and graphics. They apply trapping techniques to different parts of a single object, even if text or an InDesign object overlaps several different background colors. Trapping adjustments are made automatically, and you can define trap presets to address the requirements of specific page ranges. Meter Tonne Software Serial. You only see the effects of trapping on color separations generated by a trapping engine; you cannot see the results on‑screen within InDesign.

The trapping engine detects contrasting color edges, and then creates traps based on the neutral densities (lightness or darkness) of abutting colors, in most cases by spreading lighter colors into adjacent darker colors. The trapping settings you specify in the Trap Presets panel modify the trapping engine’s results. Built‑in trapping can trap bitmap images, such as photographs, to text and graphics. Bitmap images must be saved using a purely pixel-based file format that supports the color requirements of commercial printing. PSD (Photoshop) and TIFF are the most appropriate formats for commercial printing jobs; before using other formats, consult with your prepress service provider.

If you’re using an Open Prepress Interface (OPI) server, verify that it creates for‑position‑only (FPO) images using TIFF or PSD formats. If the images are TIFF or PSD, it may be possible to use built‑in trapping, as long as you don’t select any Omit For OPI options at output time. (Omit For OPI options are located in the Advanced section of the Print dialog box when a PostScript printer is targeted.). Both Adobe In‑RIP Trapping and built‑in trapping can trap text and graphics created with InDesign tools and placed vector PDF files. However, built‑in trapping cannot trap placed vector EPS graphics. The text, paths, and frames you create in InDesign won’t trap correctly if they overlap a frame containing a placed graphic that built‑in trapping won’t trap, such as vector EPS graphics.

(However, those objects will trap correctly with Adobe In‑RIP Trapping.) You may be able to use built‑in trapping with documents containing vector EPS graphics if you adjust the graphic’s frame. If the placed EPS graphic isn’t rectangular, try reshaping the frame closer to the graphic itself, and away from other objects.

For example, you might choose Object >Clipping Path to fit the graphics frame more tightly around the graphic. Both the Adobe In‑RIP and built‑in trapping engines can trap text characters to other text and graphics. (Built‑in trapping requires that the text and graphics are created with InDesign, and aren’t contained in imported graphics.) A text character overlapping different background colors traps accurately to all of the colors. Adobe In‑RIP Trapping can trap all types of fonts. In contrast, built‑in trapping works best with Type 1, OpenType, and Multiple Master fonts only; using TrueType fonts may result in inconsistent traps. If your document must use TrueType fonts and you want to use built‑in trapping, consider converting all TrueType text to outlines by selecting the text and choosing Type >Create Outlines. The text will become InDesign objects that trap reliably.