Use of Multicolor profiles
ZePrA works with Multicolor printer profiles or with DeviceLink profiles that permit RGB-to-Multicolor, CMYK-to-Multicolor or Multicolor-to-Multicolor conversion.
Using Multicolor profiles in a PDF workflow
ZePrA features the option of using Multicolor profiles both as the document color space and target profile and using Multicolor DeviceLink profiles for color conversion.
Particularly in prepress work for packaging, this is an important option when image data are present in the form of an RGB or CMYK file. First, you can place RGB and CMYK image files directly in the finished document. From this, you create a PDF file and convert the complete document in ZePrA to the required Multicolor color composition for printing. Another interesting field of application is the printing of photo books by so-called HiFi color printing processes using 6 or 7 inks.
Note: An Multicolor module is license required (available in the XXL package) to utilize Multicolor functions.
When preparing the data in ZePrA, the result is known as a DeviceN PDF file, where every channel is named the same as channel name of the Multicolor target profile. DeviceN is the standard color definition in PDF for describing spot colors for print production. It offers a high degree of compatibility with the proven spot color processing functions of common application programs. The PDF files generated can usually be assessed in the Output Preview of the current version of Adobe Acrobat Professional and processed with current PDF workflow systems. Positioning of the PDF files in, and export from, current Adobe InDesign documents also present no challenges. ZePrA supports the PDF/X-5n standard, which enables the embedding of Multicolor profiles in PDF files.
When configuration is created with the Auto Setup wizard (selection of a Multicolor DeviceLink profile), the default setting is such that the Multicolor target profile is not embedded in image data, but that it is embedded as the output intent in PDF files. When a converted PDF/X file (e.g. a PDF/X-4, X-3 or X-1a file), the color converted file is changed into a PDF/X5n file.
Before using your Multicolor printer profile, which was selected under Define Configuration as the Target Color Space in the Target tab, or in the Document Color Space tab when it is a Multicolor DeviceLink profile, verify whether the channel names and Lab color definitions have been entered in accordance with your specifications.
If the Embed into output file checkbox is activated, ZePrA uses the channel names and color definitions from the Multicolor printer profile set as the target color space when creating the color converted PDF file.
When Embed in output file is not checked, the channel names and color definitions are adopted from the Multicolor DeviceLink profile. Verify that the identical channel names and Lab color definitions in the target profile and the DeviceLink profile. With the help of the CoPrA’s Profile Manager, rename the Colorants (description of color channels) in accordance with your specifications and also enter the Lab color definitions in every Multicolor printer profile and DeviceLink profile.
Depending on the Multicolor profile used, the channel designations contained and the subsequent workflow outside ZePrA, we recommend that you test the complete workflow beforehand to make sure that everything runs smoothly.
Converting image data with Multicolor profiles
For converting image data with Multicolor profiles, ZePrA supports PSB, PSD, TIFF and JPEG files. Since the current file format specifications (as at May 2014) do not provide for embedding Multicolor profiles in TIFF, JPEG, PSB and PSD files, for image data conversion ColorLogic recommends deactivating Profile Embedding in the Document/Target tab. We recommend that image data to be converted to Multicolor should be saved as PSB/PSD files from Photoshop and then processed using ZePrA. Adobe InDesign can be used to process any PSB/PSD image files converted with ZePrA by means of a Multicolor target profile.
When converting the image data of Multicolor files, ZePrA distinguishes the following cases, which can be set in Configurations under Options/Image quality:
If the channel designations of the Multicolor target profile are CMYK+X, a TIFF file is created providing Preferred lossless format is set to TIFF.
If the channel designations of the Multicolor target profile are not CMYK, then a PSD file is created.
Note: TIFF only supports CMYK+X.
If the compression method is set to Automatic, the ZePrA will try to preserve the format or create a TIFF file. However in the case of a JPEG file or a non-CMYK Multicolor file, a PSD file is created.
Note: JPEG does not support Multicolor color spaces.