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FLEXO Magazine : July 2009
DESIGN PDF/X-1a) is both an application standard and a file format standard. It defines a set of conditions to govern the creation, viewing and imaging of PDF/X-1 files. Content and structure of PDF/X-1 files are limited to ensure imaging integrity. The objective is to create a “blind exchange” of graphically rich content ready for imaging. The Ghent PDF Workgroup (GWG) is an international group comprised of graphic arts users, associations and developers whose goal is to establish and disseminate process specifications for best practices in graphic arts workflows. The function of the Ghent workgroup specifications is to establish a minimum threshold. If a file fails to meet these minimum specifications, a warning flag will appear. Even if a file conforms to Ghent specifications, flexographic segment specific capabilities must also be considered. While the GWG Packaging Specification is largely PDF/X compliant, there are deviations from this rule for applications that are packaging specific. 5.3 Clip Art Clip art may come in the form of low-resolution PICTs, better-performing TIFFs, or as well-built object-oriented EPS images. Be sure to ask about the file format of the clip art being used to confirm the appropriate level of quality. If the image is a scan, identify the scanning resolution. If it was scanned at 72 pixels per inch, the clip art piece will be suitable only for display on a monitor and printing to a low-resolution printer. The selected image may be one of several on a clip art page. Remember that masking out all the other images does not remove the images; they will all be processed. Save individual images under a new name and import the single image into the document. VECTOR EPS 5.4 FPO Continuous Tone Images Whenever possible, a FPO (for position only) CT image should be created from actual high-resolution data with correct cropping and rotation. Otherwise, the high-resolution image will need to be manually placed. The letters “FPO” must be placed into the live image area because the file will go through many channels before being output and if not properly identified as a “for position only” image, it may not be replaced. 5.5 Special Effects When editing low-resolution raster files to produce special effects, document the steps used. The effects of most functions change with a change in resolution. It would be difficult to reproduce the same result with the high-resolution image without the documented information. Even with instructions, it is difficult to recreate several complicated special effects. The “action” sets within Adobe’s Creative Suite allow the creator of the low-resolution file to record each edit step, in sequence, used to create the file. The “action” set can then be saved and shared with the user that will be creating the highresolution original. 5.3: Clip Art: Clip art may come in the form of low-resolution PICTs, better-performing TIFFs, or as well-built EPS images. LOW RESOLUTION PICT 5.4: Creating and Identifying FPO Images: If an image is not properly identified as a “for position only” image, it will not be replaced.
Sustainable Spring 2009