Adobe 65023809 Printing Guide - Page 38

On an offset press, black ink is not 100% opaque. For a more accurate simulation of black opacity, enable and properly configure color management and choose to display blacks accurately (choose Preferences > Appearance of Black, and choose Display All Blacks Accurately for on screen display), or, if you have disabled color management (not recommended), you can choose the Desaturate Black command from the Separations Preview panel menu. Desaturate Black reduces the visual opacity of the black plate only (this does not affect output). Desaturate Black is redundant (and will provide an anemic display of black objects) when color management is on and accurate blacks are displayed. Keep the following tips in mind as you use the Separations Preview panel: • CMYK plates are always listed, even if, for example, the job uses only two spot colors. However, CMYK plates are not output if no colors need to be printed on them. • The Separations Preview panel lists all inks defined in a document, whether or not they are actually used in the document. Consequently, it is recommended that you delete unused spot-color swatches before viewing separations. • You can view the effect of converting spot colors to process and the effect of aliasing a spot ink (see the previous "Using the Ink Manager" in this section). Both of these options are available in the Ink Manager on the Separations Preview panel menu. • You can't preview the overprinting effects of built-in trapping or Adobe In-RIP Trapping. Separations Preview displays only the effects of overprints applied manually through the Attributes panel. You can use the Ink Limit feature in the Separations Preview panel to see if any areas of the document exceed a specified limit-for example, 320% for sheetfed printing. The total ink limit depends on the press being used to run the job, the type of stock, and other factors. If only a few small areas are highlighted in this preview, it should be no cause for alarm. But if large areas exceed the desired total ink limit, you may have to edit graphics and other content to ensure that their total ink value falls within the limit to prevent printing problems. In the Separations Preview panel, choose Ink Limit from the View pop-up menu, and enter an ink limit value. Areas in gray are within the total ink limit. Areas shown in red are over your ink limit; more intense reds indicate greater degrees of ink-limit excess. The percentages along the right side of the panel indicate the ink amounts at the location of the pointer. To view the ink percentage at any point on the layout: 1. Position the mouse where you want to evaluate the ink percentages. 2. Refer to the percentages along the right side of the Separations Preview panel. Ink values for each plate are displayed, along with the total for CMYK plates. Note: When viewing separations, the total CMYK ink value is displayed, but not the total combined ink value for overlapping process and spot colors. Position the cursor over areas of overlapping process and spot colors, and add the CMYK total value to the values displayed for spot colors. To highlight areas exceeding a total ink coverage limit, choose Ink Limit from the Separations Preview panel pull-down menu. Set the Ink Limit value for your press condition; areas exceeding the limit are highlighted in red. Overprint Preview Overprint Preview is a View mode (View > Overprint Preview) that simulates how objects set to overprint will appear in color-separated output (or composite output when the Simulate Overprint option is enabled). When Overprint Preview is on, you can see underlying objects through overprinted objects as they would appear on press. Because Overprint Preview models ink behavior, overprinted objects that use lighter or screened inks reveal more underlying inks during overprint preview because they actually are less opaque when printed. Overprint Preview also gives a more realistic view of spot colors involved with certain blending modes. In the normal, composite view, interactions between spot color objects may be misleading, so make it a habit to check files by turning on Overprint Preview. Because turning on Overprint Preview also turns on High Quality Display, you may experience a slight slowing of performance in InDesign as a result. Consequently, you may wish to turn on Overprint Preview to check content, and then turn it off once you have finished. Adobe Creative Suite 4 Printing Guide 36