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FLEXO Magazine : July 2009
PREPRESS TECHNOLOGIES & TECHNIQUES Correcting Errors at the Source VIGC Launches 13 Standard “Live Prefl ight” Profi les for Adobe InDesign CS4 T he most recent version of Adobe InDesign, one of the most widespread design applications in the printing industry, has an important new feature: Live Prefl ight. With this option, fi les can be checked for technical errors during the design phase. The Flemish Innovation Center for Graphic Communication (VIGC, Belgium) has developed 13 standard profi les for the most important market niches--and is sharing them with the printing industry, including designers, for free. Thanks to the VIGC Live Prefl ight Profi les many mistakes, and the extra costs associated with them, can be avoided. The Live Prefl ight function in Adobe InDesign CS4 is a blessing for the printing industry, as it allows you to deal with problems at the source. Trying to fi x them afterwards (e.g. in the PDF), which is the traditional process, not only leads to loss of quality, but also loss of precious time. Some errors are only detected on the printing press, or even later on. In the past, there were already tools on the market to prefl ight native fi les from design applications, like Marzware Flightcheck and EskoArtwork Deskpack checkX for Adobe Illustrator, but these are tools that need to be bought separately. Consequently, they are not used on a broad scale. That is why it is so important that Adobe now has integrated this tool into its design application, InDesign CS4. Today, designers have no reasons not to check their fi les upfront unless it is to assemble the right prefl ight profi les. Which can be a hard job, because this is something very technical. Fortunately, VIGC is fi lling this important gap in the market with the launch of its 13 VIGC Live Prefl ight Profi les for Adobe InDesign CS4 24 FLEXO JULY 2009 ESSENTIAL PARAMETERS With the Live Prefl ight in Adobe InDesign CS4 you can check around 30 important parameters. Some of them are obvious, like the number of spot colors used and the resolution of images. But some are very technical. While some are at least recommended, others are essential. Let’s take the “transparency blending space” for example. It is something that many people have never heard of. But if this is set the wrong way (RGB instead of CMYK) when you want to go to print, you will get all kinds of unwanted, strange effects where the transparency is being fl attened during PDF fi le creation when you want a PDF without live transparency. Another example is the use of spot colors and the alterna- tive defi nition of those spot colors. Most people will intuitively say it has to be CMYK, but that is the wrong choice. It is only when you choose L*a*b* colors as the alternative defi nition that you will not get unexpected color shifts. That’s because CMYK is device dependent: if you use the same CMYK percentages with different types of ink, e.g. ISO coated versus SWOP, you will get a different color. Even within one type of ink, you can have some variations between different brands. So therefore it is better to communicate the alternative defi nition of a spot color as L*a*b* colors. The other parameters are more common issues, e.g.: Missing links, OPI links Color spaces allowed Spot colors: maximum number allowed White overprinting applied Registration color applied (which will appear on all printing plates!) www. f le xography. org
Sustainable Spring 2009