Trapping imported bitmap images

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.)

Note: The behavior and precision of trapping within an OPI workflow depends on many factors, such as the downsampling method the OPI server uses to generate FPO images. For best results, consult with your OPI vendor for information about integrating Adobe trapping solutions with the vendor’s OPI server.

InDesign

Trapping imported bitmap images

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