Modifying a Page During Imaging
You can develop a printing extension to modify a page in either a device-independent or device-dependent manner during the imaging phase of printing. QuickDraw GX sends messages to the extension just after opening the spool file for imaging and just before closing the spool file at the completion of imaging. Examples of printing extensions that modify the page are:
- A confidential stamp printing extension that stamps the word "Confidential" across each page of a document as it is printed. You can set up a shared confidential printing station with this extension attached to it, and any document printed to this printing station will have the confidential stamp added to its pages.
- A background picture printing extension that gives a user a choice of backgrounds to print against. For example, a user could use this extension to add color ramps to a document being printed as slides for a presentation. Or a user could specify a picture file to use as a background picture, as shown in Figure 2-2 on page 2-8.
- A thumbnail printing extension that reduces the page size so that a number of logical pages can be printed together on one physical page. This is useful for proofing and creating story boards.
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