Adobe 23101335 User Guide - Page 370

360 CHAPTER 13 Saving and Exporting Images • DCS 2.0 format retains spot channels in the image. You can choose between saving color channel information as multiple files (as for DCS 1.0) or as a single file. The single-file option saves disk space. You can also include a 72-ppi grayscale or color composite with the image. 5 Specify an encoding method when printing to a PostScript output device: • ASCII to use the most generic encoding method. Use ASCII encoding if you're printing from a Windows system, or if you experience printing errors or other difficulties. • Binary to use a faster encoding method that produces a smaller output file and leaves the original data intact. Use Binary encoding if you're printing from a Mac OS system. However, some page-layout applications and some commercial print spooling and network printing software may not support binary Photoshop EPS files. • JPEG to use the fastest encoding method. JPEG encoding compresses the file by discarding some image data, thus reducing the quality of your printed output; for the best printed results, choose maximum quality compression. Files with JPEG encoding can be printed only on Level 2 (or later) PostScript printers and may not separate into individual plates. 6 Select Include Halftone Screen and Include Transfer Function to save the image's halftone information (including the frequencies and angles of the screens) and transfer function information. The PostScript language interpreter in some applications can use these screen settings when color separations are generated. You can also choose the Override Printer's Default Functions option in the Transfer Functions dialog box. For more information, see "Compensating for dot gain in film using transfer functions" in online Help. 7 To display white areas in the image as transparent, select Transparent Whites. This option is available only for images in Bitmap mode. 8 If you are saving to EPS format, select PostScript Color Management to instruct the printer to convert the file data to the printer's color space. Select this option only if you have not already converted the file to the printer's color space. However, do not select PostScript Color Management if you're planning to place the image into another color-managed document. Doing so may disrupt color management in your page layout application. Note: Only PostScript Level 3 printers support PostScript Color Management for CMYK images. To print a CMYK image using PostScript Color Management on a Level 2 printer, convert the image to Lab mode before saving in EPS format. 9 If the image contains vector graphics (such as shapes and type), select Include Vector Data to preserve vector data in the file. However, saved vector data in EPS and DCS files is only available to other applications; when you reopen the file in Photoshop, the vector data will be rasterized.