by clicking the arrows at the side of the page, or by using the toolbar.
by clicking anywhere on the page.
by dragging the page around when zoomed in.
by clicking anywhere on the page when zoomed in.
web sites or send emails by clicking on hyperlinks.
Email this page to a friend
Search this issue
Index - jump to page or section
Archive - view past issues
FLEXO Magazine : October 2011
Most image types allow embedding of ICC profiles to describe what they are intended to look like or where they are expected to end up. Understanding how customers create their files and if they embed profiles will go a long way in developing color communication. If your prepress department opens each digital file and verifies the resolution, scaling, orientation and other important aspects of the file, why not start “tagging” or embedding the information via an ICC profile at that point? The file is already open and the elements are already being previewed. In these cases, it may make sense to perform a color space transfor- mation at the application level. The issue to remember with performing color space transformations within the applica- tions is that we are creating device specific documents. We would need one document for Press A on styrene and one document for Press A on poly. That is not very efficient. With that said, consider “tagging” or embedding a com- mon RGB, CMYK, or other color space profile as our common denominator space. That might be one of our presses on the most commonly used press stock, or a common space based on an industry guideline such as GRACoL Coated 1, SWOP 3 or SWOP 5. These datasets were created for commercial printing, but additional datasets are being developed for packaging as well. If all of our digital elements were tagged in a common color space, we could perform the final color space transfor- mations at the RIP. A profile can be embedded in the saved image. When working in a page layout program, such as Adobe InDesign CS5, it is possible to define the preferred color spaces for the document. Many locations have moved to a PDF workflow, where the page layout, including illustrations and images, is saved as a PDF from the workflow application. PDF presets can be used to perform the color space transfor- mation of the digital content to the preferred color space. Once the files have been prepared for output and saved, the RIP is used to send information to all of the digital output devices. This includes your imagesetter, CTP device or any other digital output devices. By using the RIP, you have a single point of control over your output. It has been optimized toward an RGB, CMYK, or other color space; which has been assigned or applied within the applications during content creation, preflighting, or file prep. For example, your location could configure all of the RGB elements toward a common RGB color space, and all of the CMYK elements toward a common CMYK color space. With that standardization applied, the RIP can be used to perform the color space transformation to each desired press and substrate condition, as well as creating inkjet proofs that will predict the output of the press on the various substrates. n About the Author: Roy Bohnen is a proofing specialist for Epson America. Roy has been evangelizing and teaching the concepts of ICC since 1994. His presentation on the role of ICC Profiles in the Workflow, was included in the Optimizing FLEXO Color Profiles session at FTA’s 2011 Fall Conference: Color in Focus. Illustration 4: Note the differences in the media white point in the absolute rendering intent on the left, versus the relative colorimetric intent on the right. 90 FLEXO october 2011 www.flexography.org