Adobe PDF Library does not offer a single interface that will allow control of both Optional Content and Annotations at the same time for a PDF document. PDPageDrawContentsToMemory() allows selection of Annotation faces, but does not have control for... Read More

The first line of every PDF document is a file header with the characters “%PDF-“ followed by a version number, shown as “1.n,” where “n” would be a digit from 0 to 7. So the first line of a PDF document might look like this: %PDF-1.7 The... Read More

Optional Content is a feature that permits content to be made visible or invisible, based on switch set when being viewed in Adobe Acrobat or other viewing tool. Optional Content, or “layers,” are a useful way to present information when opening... Read More

Note: This article is a work in progress. What is PDF/UA? PDF/UA (Universal Accessibility) is a set of specifications for making PDFs accessible to persons with disabilities by imposing additional requirements over the baseline PDF specifications:... Read More

APDFL lets the client define the output color spaces. The APIs in Adobe PDF Library that set the default output color spaces are: PDPrefSetWorkingRGB PDPrefSetWorkingCMYK PDPrefSetWorkingGray These allow the client application to pass in an ICC... Read More

When using a function or object to print PDF files, you might sometimes see the print job fail, where some or all of the fonts are missing. If you embed all of the fonts in a PDF document, it can be sent to any printer, on any system. The speed of... Read More

When rendering via the PDPageDrawContentsToMemory* APIs, specify 1 BPC (Bits per Component) instead of 8 BPC when using DeviceGray as the csAtom. A component here refers to a color channel; Gray has one, RGB has three (red, green, blue), and CMYK has... Read More

A PDF document may contain thumbnail images, but they are not required. Adobe Acrobat ignores any thumbnails it finds in a PDF, and automatically generates its own temporarily when they are needed for page viewing. It does not embed its own... Read More

Suppose you want to create only a cyan or magenta color separation from an image in a PDF document. PDPageMakeSeparations() will provide PostScript separations. Datalogics offers several sample programs that demonstrate working with color separations... Read More

This error usually appears when the expiration date has passed for the link used to download an eBook from Adobe Content Server. In a normal workflow, an .acsm file is generated for a book that is used as the link to download the actual book. This... Read More