Saving, Exporting, and Previewing.
→ Saving in Adobe Photoshop
After your image has been converted to multichannel mode, you have to save it in Photoshop DCS 2.0 format. Photoshop DCS 2.0 (Desktop Color Separation) format is a version of the standard EPS format that lets you save images containing spot channels. We recommend using the following parameters when saving: TIFF (8bits/pixels) / Single File DCS, No Composite / ASCII85.
→ Exporting in Adobe InDesign
Photoshop DCS 2.0 images can be imported and exported with Adobe InDesign, like any other kind of image. When you export a PDF file from Adobe InDesign, in the Output area of the Export Adobe PDF dialog box, we recommend using Output > Color > No Color Conversion and Include All Profiles.
→ Previewing in Adobe Indesign
In Adobe Indesign, you can preview the color separation of your image:
1. On the View menu, point to Ouput, and then click Separations Preview
2. In the Separations Preview window, under separations, you can activate or deactivate the preview of each channel.
→ Previewing in Adobe Acrobat Pro
In Adobe Acrobat Pro, you can also preview the color separation of your PDF:
1. On the View menu, point to Tools, and then click on Print Production.
2. In the Print Production menu click on Output Preview. In the Output Preview, under Separations, you can activate or deactivate the preview of each channel.
At this point, it is important to make sure that your color names are correct. If the spelling of a color name is not correct, the color will appear several times. Always use the exact same name for the ink from the color library in Adobe Photoshop and InDesign (e.g. “PANTONE Red 032 C” or “PANTONE 354 C”).
For digital printing devices that only can print with CMYK colors, it is possible to convert a spot color to a CMYK equivalent color. This is sometimes an economical shortcut, but spot colors tend to be highly saturated colors, and will look less colorful when simulated by CMYK.
→ Exporting for Risograph
In Adobe Photoshop, you can easily prepare your files for Risograph:
1. Convert your image to a [RISO] profile by following the instruction in the Converting an image section.
2. Open the menu on the top right in the Channels Window and select Split Channels.
This will create a new grayscale file for each color channel in your document. These grayscale files are what we will actually send to the printer.