Adobe 23101335 User Guide - Page 398
Printing duotones, Exporting duotone images to other, applications
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388 CHAPTER 14 Printing (Photoshop) The image is converted to a multichannel image, with each channel represented as a spot-color channel. The contents of each spot channel accurately reflect the duotone settings, but the on-screen composite preview may not be as accurate as the preview in Duotone mode. Important: If you make any changes to the image in Multichannel mode, you will be unable to revert to the original duotone state (unless you can access the duotone state in the History palette). To adjust the distribution of ink and view its effect on the individual printing plates, make the adjustments in the Duotone Curves dialog box before converting to Multichannel mode. 2 Select the channel you want to examine in the Channels palette. 3 Choose Edit > Undo Multichannel to revert to Duotone mode. Printing duotones When creating duotones, keep in mind that both the order in which the inks are printed and the screen angles you use dramatically affect the final output. Click the Auto button in the Halftone Screens dialog box to set the optimal screen angles and frequencies. (See "Selecting halftone screen attributes" on page 379.) Make sure that you select Use Accurate Screens in the Auto Screens dialog box if you're printing to a PostScript Level 2 (or higher) printer or an imagesetter equipped with an Emerald controller. Note: The recommended screen angles and frequencies for quadtones are based on the assumption that channel 1 is the darkest ink and channel 4 is the lightest ink. You do not have to convert duotone images to CMYK to print separations-simply choose Separations from the Profile pop-up menu in the Color Management section of the Print Options dialog box. (See "Printing color separations" on page 389.) Converting to CMYK mode converts any custom colors to their CMYK equivalents. Exporting duotone images to other applications To prepare a duotone image for exporting to a page-layout application, save the image in EPS or PDF format (unless the image contains spot channels, in which case you should convert it to Multichannel mode and save it in DCS 2.0 format). Keep in mind that it's important to name custom colors so they'll be recognized by the other application. Otherwise the image won't print correctly-or might not print at all.