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PDF2DTP® for InDesign® Manual - 48

PDF2DTP for InDesign - OPI

It is important to understand a term known as “OPI” which stands for “Open Prepress Interface”. This is where

a low-resolution image is placed on the document page as a “placement holder” for a higher resolution image

stored in a known location. The hi-res image, which is of course a much larger file, will be located and used

in place of the lo-res picture at print time. If an image in the PDF is available on disk then a link to it will be

created. If a PDF was generated with no OPI comments then the original image name and location will of

course be unknown. If you choose “Save Missing Images” from the PDF2DTP Preferences a preview file will

be conveniently created using the original name.

PDF2DTP for InDesign - Found Links

If the link to the original image is known, PDF2DTP will import the file. If the image cannot be located then it

will convert the lo-res picture preview stored in the PDF. A problem arises due to the fact that the preview is

comprised of only those pixels that are viewable within the picture box. If you were to locate and import the

original image then its offset in the picture box may change if the image dimensions are greater than the

picture box.

PDF2DTP for InDesign - Standard OPI Disabled at PDF Creation Time

Most PDFs are generated by an application where the Export PDF “Use OPI” setting is not turned on in which

case the PDF will not contain a name for the image. The link to the path location of the original image is

therefore unknown.

PDF2DTP for InDesign - Clipping Paths

If the original image exists it will be imported and the application will use the default Clipping Path for the

image (if one exists). If the image is missing, or no link exists, you can add a Clipping Path to the created

preview file by selecting the PDF2DTP “Clipping Paths” Preference.

If a conversion reveals a picture box where the image is not being shown properly, for example is only

partially displayed, the first trick to try is to examine the Clipping Path. This can be done in the application by

either editing the points of the path or by deleting the path altogether.

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