Adobe 22020807 User Guide - Page 109

USING ACROBAT 9 PRO 103 Creating PDFs Color Management Policies Specifies how Distiller converts unmanaged color in a PostScript file when you don't use a Distiller color settings file. This menu is available when None is selected in the Settings File menu. Note: Color Management Policies values may affect a PDF differently depending on the compatibility setting you choose in the General panel. • Leave Color Unchanged Leaves device-dependent colors unchanged and preserves device-independent colors as the nearest possible equivalent. This is a useful option for print shops that have calibrated their devices, have used that information to specify color in the file, and are only outputting to those devices. • Tag (Or Convert) Everything For Color Management Tags color objects with an ICC profile and calibrates colors, making them device-independent in PDFs compatible with Acrobat 4.0 (PDF 1.3) and later. Converts devicedependent color spaces in images (RGB, Grayscale, and CMYK) to device-independent color spaces (CalRGB, CalGray, and Cie L*a*b) in Acrobat 3.0 (PDF 1.2) compatible PDFs. • Tag (Or Convert) Only Images For Color Management Tags ICC profiles in images only (not text or vector objects), which prevents black text from undergoing any color shift when distilling Acrobat 4.0 (PDF 1.3) compatible PDFs. Converts device-dependent color spaces in images (RGB, Grayscale, and CMYK) to device-independent color spaces (CalRGB, CalGray, and Lab) in Acrobat 3.0 (PDF 1.2) compatible PDFs. • Convert All Colors To sRGB (or Convert Everything To CalRGB) Calibrates color, making it device-independent. Converts CMYK and RGB images to sRGB in PDFs compatible with Acrobat 4.0 (PDF 1.3) or later. Converts CMYK and RGB images to calibrated RGB (CalRGB) in Acrobat 3.0 (PDF 1.2) compatible PDFs. Recommended for PDFs that will be used on-screen or with low-resolution printers. • Convert All Colors To CMYK Converts color spaces to DeviceGray or DeviceCMYK according to the options specified in the Working Spaces menu. All Working Spaces must be specified. Document Rendering Intent Choose a method to map colors between color spaces. The result of any particular method depends on the profiles of the color spaces. For example, some profiles produce identical results with different methods. Acrobat shares four rendering intents (Perceptual, Saturation, Relative Colorimetric, and Absolute Colorimetric) with other Creative Suite applications. Acrobat also includes a rendering intent called Preserve, which indicates that the intent is specified in the output device rather than in the PDF. In many output devices, Relative Colorimetric is the default intent. Note: In all cases, intents may be ignored or overridden by color management operations that occur subsequent to the creation of the PDF file. Working Spaces For all Color Management Policies values other than Leave Color Unchanged, choose a working space to specify which ICC profiles are used for defining and calibrating the grayscale, RGB, and CMYK color spaces in distilled PDFs. • Gray Choose a profile to define the color space of all grayscale images in files. The default ICC profile for gray images is Adobe Gray - 20% Dot Gain. Choose None to prevent grayscale images from being converted. • RGB Choose a profile to define the color space of all RGB images in files. The default, sRGB IEC61966-2.1, is recognized by many output devices. Choose None to prevent RGB images from being converted. • CMYK Choose a profile to define the color space of all CMYK images in files. The default is U.S. Web Coated (SWOP) v2. Choose None to prevent CMYK images from being converted. Note: Choosing None for all three working spaces has the same effect as selecting the option Leave Color Unchanged. You can add ICC profiles (such as ones provided by your print service bureau) by placing them in the ICCProfiles folder in the Common folder, the Windows\System\Color folder (Windows), or the System Folder/ColorSync folder (Mac OS). Last updated 9/30/2011