Category: mungenet

Overprinting & Trapping in Adobe PDF Quick Note

version 1.2

As Acrobat 5.0 has this new cool “Overprint Preview” feature. And as Barney Kassabian has prompted me, this raises the whole issue of QuarkXpress and overprints/trapping.

Over the last 2 years, I was under the impression that overprints were retained in composite Quark Postscript files. I was only partly correct, or a bit wrong. You choose. To clarify, I have been experimenting.

Overprinting in QuarkXpress 3.32 to Adobe PDF

If you save out of QuarkXpress 3.32 as an EPS, Quark keeps the overprinting settings (as set in the View>Trap Information palette). Distilling this with Acrobat Distiller 4.05 or 5 results in a PDF where the overprint is retained. New in Acrobat 5.0 – you can view this on screen.

However, if you use the Adobe preferred method of “Printing” via AdobePS to the Distiller (Mac: Create Adobe PDF, PC: Acrobat Distiller printers) — the overprinting information is NOT retained in the Postscript.

If you are a Postscript jockey, you can see the simple command is just plain missing from the Printed .ps file:

What about QuarkXpress 4.x? Thankfully, QuarkXpress 4.x exports the “stovp” Postscript command when printing. Other trapping details are NOT retained in the composite Postscript output.

“T stovp‘ — set overprint on the next drawn object to true — in English. This particular command (stovp) is defined in both the EPS and the standard Postscript headers of a QuarkXpress 3.32 Postscript file; its a QuarkXpress specific command in their Postscript header. Its just that the Composite Postscript printed from Quark happens to be missing the appropriate overprint command.

If you are wise to the ways of Postscript, or willing to shoot off your own foot, you can insert this command into the Printed postscript file from the the EPS version and viola! you have overprinting in the Printed output. Be warned! This may result in a Postscript file that is no longer valid; it may not RIP; and the Distiller may ‘spit its cookies’ at you. You have been warned. Don’t try this at home. I am a trained professional. Your mileage may vary. Insert standard legal disclaimer here.

The good news in this is that overprint information IS LEFT in the EPS files; placed from Illustrator or Quark generated EPS.

So, what is the recommended workflow? Out of QuarkXpress 3.32, save each page as an EPS file. Place each of these EPS files BACK into a QuarkXpress document (or InDesign document ) and THEN follow the guidelines of Printing to the Distiller via AdobePS.

Please note: you should not nest EPS file inside EPS files inside EPS files. Why not? Each EPS saves a graphic state before srawing its contents; at least once. There is a limit of 15 of these in Postscript 3; and depending on the content in the EPS, the RIP may cause a ‘limitcheck’ Postscript error.

Also please note: When creating and Distilling EPS files from QuarkXpress, note that Quark does not embed the fonts. This restriction forces you to Distill on the creating machine. Otherwise, there is the risk that you create a PDF where the fonts are not embedded.

And the resulting PDF displayed in Acrobat 5.0 with Overprint Preview turned on:

Another method, albeit more prone to trouble, is taking the EPS files created above and Distilling these directly. The trouble that you might find in this method is that the Distillers “Default Page Size” is used, UNLESS you have “Resize Page and Center Artwork for EPS Files” checked in the Advanved Tab.

Evidendly, Quark’s Composite postscript output changed in QuarkXpress 4.0x — where the overprinting settings were retained. This is good news.

Trapping

In a slightly similar fashion, QuarkXpress only saves its choking/spreading information when it prints Separations (usually not the default PDF workflow) or if you export as a DCS file. Once you save as a DCS file, you have separated your work. The choking/spreading is not saved when you save as EPS.

How do you “recompose” the separated DCS file/separated QuarkXpress file into a composite PDF? Apart from using a Modern Prepress application like InDesign? Adobe InDesign: Prepress Techniques

Thankfully, CreoScitex have an Acrobat plugin called CreoScitex Seps2Comp You can download a trial version Windows and/or MacOS from their web site.

It takes a multiple page PDF and allows you to “recombine” them into a composite PDF. In theory, common elements will exist in exactly the same place across the different plates. Its a matter of then adding the images/graphics back together and generating a composite image on screen. To do this manually involves creating channels in a Photoshop file (one channel for each of C, M, Y and K) — but you are left with a purely bitmap image.

Here is a screen dump of Sep2Comp in action. Its just a simple matter of applying a certain ink to the page that contains that plate. In Pre-separated Postscript, there is a special command that details how the separation is composed; Seps2Comp reads this and automatically applies the appropriate plate to ink.

And the final result

Also good news is that PageMaker 6.x and InDesign 1.x saves composite Postscript with Trapping & Overprinting by default. There is no need for all this jumpling through hoops and funny business.

This is a screen dump of Acrobat 5.0 showing the effect of trapping using the default settings. As many of these traps have been set to overprint – you can see the traps live on screen. Cool.

InDesign 2.0: Generating Composite, Trapped PDFs has more info on how to do with with InDesign 2.0.

Adobe’s Support site on Trapping:

Trapping in InDesign 1.x

Trapping in PageMaker 6x

Quark’s Support site has good overviews of Trapping and Overprinting:

Trapping Overview from Quark

Thanks to Shane Stanley for suggesting the nested EPS change; Barney Kassabian for prompting this research & supplying test files; Grant Gittus for running his experienced eyes over my comments.

Rollover Styles in ImageReady 3.0 ImageReady 3.0 comes with Photoshop 6.0. One of the new features is the ability to create Styles that include Rollover states. There is a slight nuance, however. You must create the style from a Layer Based Slice. This module is © 2000 Adobe Systems, Inc and cannot be reproduced without the written consent of the author.
1. Select the layer that you wish to create the slice over. In this instance, I have created a shape that encompasses the rollover.
2. Menu Layer>New Layer Based Slice
3. From the Rollover palette, create a new rollover state by clicking on the button.
4. Change the Layer Style for the new rollover state. I have used an inner shadow in this example.
5. From the Styles palette, click on the new button. Ensure that “Include Rollover States” is checked.
6. Now the style is created, it is a simple matter of dragging this style over the other two layers where you wish to create the rollovers.
7. Now the three Layer based slices and rollover states are created.
8. You may need to optimise your slices as layer based slices are automatically sized to fit the content of the layer. This sometimes leaves “fringing” table cells and images, increasing the complexity of your slice. Just promote the layer based slices to user slices using the menu Slices>Promote to User Slice This will allow you to change the slice sizes to get an optimal table and images.

Weighted Optimisation in Photoshop 6.0 There is a new feature in Photoshop 6.0: Weighted optimisation. This allows a single JPEG or GIF image to have variable compression . There is no special browser plug in required; and is reasonably easy to set up. It is useful when there is a featured object, or text that must be of high quality, and the rest of the image is needed to be as small as possible. This module is © 2000 Adobe Systems, Inc and cannot be reproduced without the written consent of the author.
1. Create a selection around the object you wish to have in high quality.
2. Feather the selection, and Expand the Selection (Select>Feather and Select>Modify>Expand)
3. From the Channels palette, click on the “Create Channel from Selection” button Name the selection something useful.
4. File>Save For Web. The button to click on to access the Modify Quality is the small circle.
5. The black marker on the slider represents the black area in the chosen channel. Therefore, the black areas are getting a greater compression setting in the JPEG compression algorithm. The white end of the slider is having less compression. Areas in between get variable compression depending on the ‘greyness’
6. With GIF images, there is no compression per se. Therefore, with GIF compression the Save for Web dialog box changes the lossiness of the GIF which reduces the resulting file size.

November 1997	End of Year Update Roadshow (tecjhnology update for Apple’s customers in Australia)
June 1997	WWDC Update Roadshow (representing the technologies and strategies of Apple to customers and developers in Australia)
May 1997	WWDC, San Jose
February to April 1997	EasyRider ’97 Roadshow (Internet and Intranet using Apple and Apple-related technology)
January 1997	San Francisco MacWorld

October 1998	Art of Illustration Roadshow: Adobe Systems: Australia and New Zealand
August 1998	Transition to Adobe Systems Pacific as Applications Specialist
June 1998	Re-presentation of Programming WebObjects I Course, Sydney
May 1998-June 1998	WWDC 1998 Update Roadshow, Publishing Update Roadshow
May 1998	Attended WWDC’98, San Jose, California
February 1998	Attended Programming WebObjects I and II course, Cupertino, California. WebObjects is a piece of technology Apple inherited (and still seems to be the forgotten middle child) when it purchased Steve Job’s NeXT, Inc in 1997. WebObjects 3.0 and later uses Java extensively as its programming language. I still miss WebObjects at Adobe …

May 1999	Implementation of Adobe Solutions Network, Service Provider Program
May 1999	Future of Publishing Roadshow (Adobe InDesign, Adobe PressReady, Adobe GoLive, Adobe Acrobat)
February 1999	Adobe Tech Summit, San Jose
January 1999	Adobe Sales Conference, San Francisco

October-November 2000	Stay on the Edge (Photoshop 6) Roadshow. Incorporating special 1.5 hour indepth session
November 2000	Shred the Web Roadshow: South East Asia (Singapore, Malaysia & India) Appearred on CNBC “e” with Keith Lui. Live TV interview (not a prerecord)
August 2000	Adobe Tips, Tricks and Techniques Roadshow, Pacific
July 2000	Transition to Technical Resources Manager, Pacific and South East Asia for Adobe Systems
May 2000	Shred the Web Roadshow: Pacific
May 2000	Assistance to the 3DAP (PDF Guidelines for Magazine Advertising Delivery) in the creation of the “3DAP Guidelines for Digital Advertising Delivery”.
March 2000	Adobe Tips, Tricks and Techniques Roadshow: Pacific

September 89	As part of honeymoon, visited Apple Computer headquarters in Cupertino, California. Visited Apple Pacific and liaised with AppleCentre task force team and shopped at the “company store”.
April-September 1991	Moved from Technical Support Manager to Corporate Systems Engineer, responsible for Beneficial Finance, BHP Whyalla, Kinhill Engineers, Australian Submarine Corporation, F. H. Faulding & Co, and CRA Exploration. This role involved the all technical aspects of Macintosh usage in these corporates. Regular newsletters and fact sheets were also compiled and sent out, along with Corporate User Group Meetings and one-on-one technical sessions with their Technical Staff. Early experimentation with Ethernet, QuickMail, Apple’s A/UX and other technically challenging products pioneered at AppleCentre Adelaide were introduced to these Corporates and in many cases adopted as Corporate platforms. This role, whilst extending to September 1991, involved levels of Account Management and liaison with developers and distributors in Australia and the US. Close ties were created with Tri Data Communications, Keyway (now Conexus), Apple Sydney and Melbourne.
December 88	Completed writing chapter for the book “Tricks of the HyperTalk Masters” about using HyperCard as a front end tool to communications services. This book was published in 89 by the Waite Group, Mann County, USA. (ISBN 0-672-48431-5)
November 88	Employed and Trained new Technical Support team members. August 88 Appointed Manager of Technical Support at Random Access.
January 88	Appointed prime Technical Support contact for the Australian Submarine Corporation. This included daily liaison with Kay Lindley, PC & OA Supervisor and Brian Musker, MIS Manager.
September 87	Attended Apple Service Training in Sydney, achieving Level 1 Accreditation for Macintosh II hardware.
January 87	Moved from Sales to join the one man Technical Support team as a trainee Technical Support Analyst. In 1987 the world of Macintosh was just about to explode into ethernet networks, open systems with the Macintosh II and AppleShare. Supported Apple platforms ranged from the Macintosh, to the Apple II, to the rare Apple III.
August 86	Achieved highest sales in the month.
January 86	Commenced work at Random Access as a Junior Trainee Salesman. Job roles included store management and initial customer contact.

June 1990	As Systems Engineer with AppleCentre Adelaide, provided prime Technical contact for the Co-operative Group bid. AppleCentre Adelaide won this bid over IBM Australia as “it was the safer choice”. This bid involved the integration of a network of Macintoshes into an IBM 4381 host.
April 1990	Attended “A/UX Systems Administration” course at Apple Computer, Sydney.
February 1990	Appointed AppleCentre “Building the Difference” Trainer/Motivator for AppleCentre Adelaide. Attended training course in Sydney in April.

December 1993	Created client/server EIS/Query system called “Sherlock”. Written using VICOM. Macintosh front end displays data and executes Oracle SQL queries. Sherlock also integrates agent-based architecture into Random Access electronic mail system.
December 1993	Sold 200 licenses of VICOM into E&WS after extensive testing of TN3270 emulation at E&WS to Tandem Cyclone and ETSA IBM Mainframe.
November 1993	Installed a uucp-style connection to connect.com. Installed Mail, UseNet news and other services on a Random Access’ Sun server.
September 1993 – October 1993	Assisted DPA Computing in installation of new Sun/Oracle based School Management system for Walford CEGS.
August 1993 – September 1993	Part of team at Random Access Consulting that outsourced to the Cooperative Group in Macintosh, Windows, Netware and IBM Mainframe technical support.
September 1993	Started Newton development research for inhouse projects and evaluation for external consulting.
September 1993	Attended Apple Workgroup Server training, in Sydney.
September 1993	Project Managed and implemented cut over from old single user accounting system to new multiuser Sun/Oracle CFACS system. September was a $1.4 million revenue month for Random Access, very close to the company’s record at that time.
August 1993 – August 1994	Appointed as Technical Consultant and Technical presenter to Technology in Management project at the Douglas Mawson Institute of TAFE. This course will presented over 5 days in March 1994. This project is a joint venture between Random Access Consulting and Douglas Mawson Institute of TAFE.
August 1993	Consulted to Young & Rubicam for Desktop strategy in Melbourne. Also assisted in technical considerations in move to new building in early 1994.
June 1993	Presented Macintosh Futures Debriefing from the Apple World Wide Developers Conference to senior management of Random Access customers.
May 1993	Provided technical Consultation to IPEC Group in the integration of Macintoshes into their Delivery Note EDI system.
May 1993	Attended Apple World Wide Developer Conference, San Jose, USA. The WWDC is a once a year seminar where Apple present their technologies such as System 7, PowerPC and Newton to their developer community.
April 1993	Attended Windows NT Technical Seminar presented in Adelaide by Microsoft Australia.
April 1993	Provided Technical Consultation to CSIRO Division of Soils in Macintosh to Unix/TCP/IP integration.
April 1993	Assisted Mike Seyfang and Fujitsu Australia with the integration of Macintoshes into Novell Netware network and Unix-based PICK system at the City of Henley & Grange.
April 1993	Sold a volume license of VICOM for TV1950 emulation to the E&WS Department.
March 1993	Chose CFACS as product of choice for Random Access Pty Ltd’s new accounting system. Attended training at Cedardata.
March 1993	Attended Quality Auditor’s Course presented by Aptech Australia.
February 1993	Random Access Consulting appointed Australian and New Zealand distributor of VICOM. VICOM is a front ending tool for the Macintosh, written in the UK.
February 1993	Consulted to the Australian Submarine Corporation in Macintosh integration using DECWindows XWindows protocol.
January 1993	Attended the MacWorld Exposition, San Francisco, USA. MacWorld is a one of two major events in the Macintosh community for the display of products and services.