Adobe 62000112DM User Guide - Page 114

ADOBE ACROBAT 3D VERSION 8 107 User Guide • Preserve Retains the transfer functions traditionally used to compensate for dot gain or dot loss that may occur when an image is transferred to film. Dot gain or loss occurs when the ink dots that make up a printed image are larger or smaller than in the halftone screen. • Apply Applies the transfer function, changing the colors in the file but doesn't keep it. This method is useful for creating color effects in a file. Preserve Halftone Information Retains any halftone information in files. Halftone information is intended for use with a particular output device. Advanced panel options The Advanced options specify which Document Structuring Conventions (DSC) comments to keep in a PDF and how to set other options that affect the conversion from PostScript. In a PostScript file, DSC comments contain infor­ mation about the file (such as the originating application, the creation date, and the page orientation) and provide structure for page descriptions in the file (such as beginning and ending statements for a prologue section). DSC comments can be useful when your document is going to print or press. When you work with the Advanced options, it is helpful to have an understanding of the PostScript language and how it is translated to PDF. See PostScript Language Reference, Third Edition (Addison-Wesley) and PDF Reference Fifth Edition: Adobe Portable Document Format Version 1.6 on the PDF reference page (English only) on the Adobe website. The same website has more detailed descriptions of the Advanced options and their parameters. Note: The ASCII Format option has been removed from Distiller, but is still available as a Distiller parameter. Allow PostScript File To Override Adobe PDF Settings Uses settings stored in a PostScript file rather than the current PDF settings file. For details, see the documentation available for download on the Acrobat SDK documen­ tation page (English only) of the Adobe website. Allow PostScript XObjects PostScript XObjects store fragments of PostScript code to be used when a PDF is printed on a PostScript printer. Use only in controlled workflows where there is no other option. Available when the Standard or Smallest File Size is selected from the Default Settings menu. Convert Gradients To Smooth Shades Converts blends to smooth shades for Acrobat 4.0 and later, improving quality and reducing file size of PDFs. Distiller converts gradients from Adobe Illustrator, Adobe InDesign, Adobe FreeHand, CorelDraw, QuarkXPress, and Microsoft PowerPoint. Convert Smooth Lines To Curves Reduces the amount of control points used to build curves in CAD drawings, which results in smaller PDFs and faster on-screen rendering. Preserve Level 2 Copypage Semantics Uses the copypage operator defined in PostScript Level 2 rather than in Language Level 3 PostScript. If you have a PostScript file and select this option, a copypage operator copies the page. If this option is not selected, the equivalent of a showpage operation is executed, except that the graphics state is not reinitialized. Preserve Overprint Settings Retains any overprint settings in files being converted to PDF. Overprint settings create color by printing one ink on top of another ink. Overprinting Default Is Nonzero Overprinting Prevents overprinted objects with zero CMYK values from knocking out CMYK objects beneath them. Save Adobe PDF Settings Inside PDF File Embeds the settings file (.joboptions) used to create the PDF as an attachment. (To view the settings file, choose View > Navigation Panels > Attachments in Acrobat.) Save Original JPEG Image In PDF If Possible Processes compressed JPEG images (images that are already compressed using DCT encoding) without recompressing them. When deselected, performance improves because only decompression, not recompression, occurs.