Harlequin Core (HHR) – Global Graphics Software blog

February 2, 2023February 23, 2023

Digital watermarking in print workflows – Part 2 – When to add a digital watermark

In this second post about digital watermarking in the print workflow, author Martin Bailey explains the stages when it’s possible to add a digital watermark.

Digital watermarking is an emerging technology, part of the latest step on the evolution of product identification. Global Graphics Software has partnered with Digimarc, a leader in digital watermarking and a member of our Partner Network, to explore this topic and future developments.

Adding a digital watermark during the design stage

In some workflows the designer may apply digital watermarks to a design by, for instance, using a plugin to an application such as Adobe Illustrator. This is equally appropriate for both steganography and an artwork masking layer, and gives the maximum opportunity for approval of the design with the digital watermark in place, and for any rework to the design that might be requested to realize the greatest benefit from using that watermark.
It will not normally be appropriate for the digital watermark to be added by the designer if each instance of the print requires unique data to be encoded in it; variable data composition is usually performed later in the workflow.

Application of digital watermarking has different advantages and disadvantages at various stages in the design and production workflow.

Adding a digital watermark in composition/prepress

In other workflows adding the digital watermark may be a function of a variable data composition or prepress department. Just as for application by the designer, this is applicable for both steganography and an artwork masking layer. There is a reasonable opportunity for approval of the design with the digital watermark in place. But it would be slower and more expensive to rework the design if that is required at this stage than if the watermark were added by the designer.

If the digital watermark is added in prepress then it can carry both static and variable data. As discussed above, however, variable data is best suited to use of an artwork masking layer rather than steganography, if only because of the amount of data that must be generated and then incorporated into a PDF file when steganography is used for a significant number of unique codes.

But applying even an artwork masking layer in prepress does bulk up the resulting print-ready PDF file with many copies of that layer, each one carrying different data. And it can also slow down processing in the Digital Front End (DFE) for a digital press. An overprinted graphic covering large areas of each piece of output in the PDF file can make it harder for the variable data optimization in a DFE to break the design apart so that it can minimize the total amount of processing required to read, color manage, render and halftone screen the job. (See Global Graphics Software’s guide: Full Speed Ahead: How to make variable data PDF files that won’t slow your digital press.)

Late-binding in the Digital Front End (DFE)

A new development in the application of digital watermarking is to add the marks right at the very last minute before the data is printed. In our SmartDFE™, for example, this can be done in parallel with or after the color management and rendering.

Applying the watermarks in parallel with color management and rendering (in the RIP) allows full access to all color channels for the output, while also removing the need to generate a fully resolved “optimized PDF” or PDF/VT file containing all of the variable data further upstream. In turn, this can reduce the overhead of optimizing variable data processing in the RIP. The final result is increased throughput, both in composition/prepress and in the DFE.

Applying marks after the RIP enables even higher performance through the DFE, with the added benefit of providing a more predictable processing speed because the amount of processing required is more deterministic than is rendering PDF. This might restrict the watermark to be painted in only one color channel, though.

Increasing speed and predictability in the DFE allows the use of lower cost hardware in those DFEs, or assists with printing at full engine speed for a larger proportion of jobs.

Late-binding application of digital watermarks will also always occur in an environment where the characteristics of the press that will be used to print the items are known, including resolution, bitdepth etc.

These benefits make this the optimum choice for highly efficient printing workflows for variable data digital watermarks, driving digital presses at full engine speed. The trade-offs are that it’s a little harder to review and approve proofs of the output, and that use for images with steganography is not usually appropriate.

This is an excerpt from the white paper: Optimizing Digital Watermarking in Print Workflows. To learn more about digital watermarking download your copy:

DOWNLOAD YOUR COPY OF THE WHITE PAPER

About the author

Martin Bailey, CTO, Global Graphics Software

Martin Bailey, former distinguished technologist at Global Graphics Software, is currently the primary UK expert to the ISO committees maintaining and developing PDF and PDF/VT. He is the author of Full Speed Ahead: how to make variable data PDF files that won’t slow your digital press, a guide offering advice to anyone with a stake in variable data printing including graphic designers, print buyers, composition developers and users.

Digital watermarking in print workflows – Part 1 – How to add a digital watermark

Digital watermarking is an emerging technology, part of the latest step on the evolution of product identification. Global Graphics Software has partnered with Digimarc, a leader in digital watermarking and a member of our Partner Network, to explore this topic and future developments.

In this first of two posts, Martin Bailey explains the ways you can add a digital watermark:

A digital watermark may be added in one of two ways:

1. Using steganography
If a product design includes images, whether photographic or generated digitally, data can be hidden within that image data using steganography. Steganography is the practice of concealing a message within another message or a physical object (source: Wikipedia).

In order to hide the data, the color values of individual pixels in the image are altered in a way that is intended to not be obvious to the human eye. The alterations may need to be applied slightly differently depending on the image content and the print technology to be used. This means it’s often valuable to be able to proof a design with the images in place, and to do that either on the printing device that will be used for production, or on one that has been carefully tuned to reproduce color, tones and levels of detail to match that production device.

Alternatively both the printer/converter and their customer can inspect the artwork and verify the Digimarc code using PACKZ® or CLOUDFLOW® Proofscope, professional prepress tools from HYBRID Software. As well as checking for the correctness of the code, this also allows verification that the code placement conforms to the customer’s requirements, and supports a formal approval process.

Reviews of the proofed output may lead to a decision to re-embed the data into the image with slightly different parameters. Systems to automate that adjustment are improving, but the advisability of proofing means that steganography is best used at a point in the workflow where an appropriate review and reconfiguration may be made without disrupting throughput.

Steganography is a very effective technique if the same image will be used on every instance of an item because it can be difficult for a forger to reproduce. But if your goal is to encode unique data in each instance, you’d have to generate an altered image for each one. When you’re producing watermarks for a large number of instances that would mean generating a huge number of copies of what started off as a single image. In most workflows and for most products that’s not a commercially viable approach.

2. Artwork masking layer
The second method for adding a digital watermark is to overlay an “artwork masking layer” that encodes the desired data. This is a pattern of graphics across large areas of the design, making sure that those graphics are sufficiently fine that they are not immediately apparent to a viewer. In practice this usually means something that looks like a sprinkling of very fine dots under a magnifying glass or loupe.

A digital watermark as an artwork masking layer over a plain yellow area of a job.

These overlays are also very difficult for a forger to reproduce. They have the advantage over hiding data in images that they can also be used in efficient workflows to carry unique data for each product instance; there is much less data to handle for every copy.

This is an excerpt from the white paper: Optimizing Digital Watermarking in Print Workflows. To learn more about digital watermarking download your copy:

DOWNLOAD YOUR COPY OF THE WHITE PAPER

About the author

Addressing real-world software challenges in the print industry

It’s always good to see our technology being used in the ‘real world’; it really helps us to understand our customers’ daily challenges so we can develop software to make their lives easier.

With this in mind, we recently visited Baker Labels, a leading UK trade label printer with over 45 years’ experience in the business. Bakers has three HP Indigo WS6900 presses, an HP Indigo 20000 press, a Truepress Jet L350 UV and L350 UV+LM inkjet press, as well as a Nilpeter FB3 flexographic press.

Managing director Justin Bailey reflects on our visit:

Global Graphics Software’s technology is used by many thousands of printing companies around the world. We’re committed to innovation and to continue to innovate it’s important that our software developers understand the challenges faced by those companies in the printing industry. I wanted to take our team to an environment where the code they have written might be used.

I set out to find a printing company that shared our values in innovation and would be happy to show us around their facilities. My research led me to Baker Labels, a leading UK print provider for the label and packaging market, who embraced the idea of welcoming us and showing us round.

The thing that struck me immediately about Bakers, was the pride they had in their business and the culture they had built, which clearly radiated as soon as you walked through the door. It was also a bonus to learn that they use PACKZ® and CLOUDFLOW® from our sister company, HYBRID Software, to automate many of their processes.

Bakers also work very closely with HP Indigo in both their label printing business, and BakPac, their flexible packaging business. This meant that our Harlequin RIP® engineers could see presses working that used the technology they had developed deep inside the HP Indigo digital front end. This gave them a sense of real purpose and pride.

HP Indigo 6900 at Baker Labels — One of the HP Indigo 20000 presses at Baker Labels.

Baker’s BakPac digital flexible packaging business prints short to medium runs of stand-up pouches, pillow pouches and printed film for trade customers looking for a high-speed-to-market option for their customers.

Bakers’ domain expertise was clear for our team to see: Jamie Godson did an incredible job of explaining the application of technology and challenges that they face within the industry; Jamie Doogan provided important perspective on commercial considerations; and Simon Chandler shared his perspectives on technical infrastructure necessary to stay competitive in the market.

Feedback from my team was overwhelmingly positive and the energy that they got from the visit will be something that I am confident will continue to resonate within our engineering team, spurring on new ideas to solve challenging technical problems. Bakers’ willingness to engage in such conversations will no doubt help us all to do what we do better and facilitate solutions which may well have a broader market application.

On behalf of the Global Graphics Software and Hybrid Software Group PLC, I would like to express my gratitude to Steve Baker and his team for their incredible hospitality and willingness to collaborate. It’s meeting people at companies like Bakers that makes getting out of bed in the morning exciting, and it’s no surprise to me that they are as successful as they are. Long may it continue.

Managing director, Justin Bailey, left, with the team from Global Graphics Software and Jamie Godson, Jamie Doogan and Simon Chandler from Baker Labels.

Justin Bailey, Managing Director, Global Graphics Software

Justin Bailey has been managing director at Global Graphics Software since 2018. He has over 25 years’ experience in the document imaging and print markets.

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May 31, 2022July 25, 2022

A nostalgic look back at the ISO PDF/X standard

In this blog post, Martin Bailey recalls his days as the first chair of the ISO PDF/X task force and how the standard has developed over the last 20 years.

Over the last few years there has been quite an outpouring of nostalgia around PDF. That was first for PDF itself, but at the end of 2021 we reached two decades since the first publication of an ISO PDF/X standard.

I’d been involved with PDF/X in its original home of CGATS (the Committee for Graphic Arts Technical Standards, the body accredited by ANSI to develop US national standards for printing) for several years before it moved to ISO. And then I became the first chair of the PDF/X task force in ISO. So I thought I’d add a few words to the pile, and those have now been published on the PDF Association’s web site at https://www.pdfa.org/the-route-to-pdf-x-and-where-we-are-now-a-personal-history/.

I realised while I was writing it that it really was a personal history for me. PDF/X was one of the first standards that I was involved in developing, back when the very idea of software standards was quite novel. Since then, supported and encouraged by Harlequin and Global Graphics Software, I’ve also worked on standards and chaired committees in CIP3, CIP4, Ecma, the Ghent Working Group, ISO and the PDF Association (I apologise if I’ve missed any off that list!).

It would be easy to assume that working on all of those standards meant that I knew a lot about what we were standardising from day one. But the reality is that I’ve learned a huge amount of what I know about print from being involved, and from talking to a lot of people.

Perhaps the most important lesson was that you can’t (or at least shouldn’t) only take into account your own use cases while writing a standard. Most of the time a standard that satisfies only a single company should just be proprietary working practice instead. It’s only valuable as a standard if it enables technologies, products and workflows in many different companies.

That sounds as if it should be obvious, but the second major lesson was something that has been very useful in environments outside of standards as well. An awful lot of people assume that everyone cares a lot about the things that they care about, and that everything else is unimportant. As an example, next time you’re at a trade show (assuming they ever come back in their historical form) take a look and see how many vendors claim to have product for “the whole workflow”. Trust me, for production printing, nobody has product for the whole workflow. Each one just means that they have product for the bits of the workflow that they think are important. The trouble is that you can’t actually print stuff effectively and profitably if all you have is those ‘important’ bits. To write a good standard you have to take off the blinkers and see beyond what your own products and workflows are doing. And in doing that I’ve found that it also teaches you more about what your own ‘important’ parts of the workflow need to do.

Along the way I’ve also met some wonderful people and made some good friends. Our conversations may have a tendency to dip in and out of print geek topics, but sometimes those are best covered over a beer or two!

About the author

Martin Bailey is currently the primary UK expert to the ISO committees maintaining and developing PDF and PDF/VT and is the author of Full Speed Ahead: how to make variable data PDF files that won’t slow your digital press, a new guide offering advice to anyone with a stake in variable data printing including graphic designers, print buyers, composition developers and users.

What you need to build a press that must handle variable data jobs at high speed

I’ve spoken to a lot of people about variable data printing and about what that means when a vendor builds a press or printing unit that must be able to handle variable data jobs at high speed. Over the years I’ve mentally defined several categories that such people fall into, based on the first question they ask:

“Variable data; what’s that?”
“Why should I care about variable data, nobody uses that in my industry?”
“I’ve heard of variable data and I think I need it, but what does that actually mean?”
“How do I turn on variable data optimization in Harlequin?”

If you’re in the first two categories, I recommend that you read through the introductory chapters of our guide: “Full Speed Ahead: how to make variable data PDF files that won’t slow your digital press”, available on our website.

And yes, unless you’re in a very specialised industry, people probably are using variable data. As an example, five years ago pundits in the label printing industry were saying that nobody was using variable data on those. Now it’s a rapidly growing area as brands realize how useful it can be and as the convergence of coding and marking with primary consumer graphics continues. If you’re a vendor designing and building a digital press your users will expect you to support variable data when you bring it to market; don’t get stuck with a DFE (digital front end) that can’t drive your shiny new press at engine speed when they try to print a variable job.

If you’re in category 3 then you’re in luck, we’ve just published a video to explain how variable data jobs are typically put together, and then how the DFE for a digital press deconstructs the pages again in order to optimize processing speed. It also talks about why that’s so important, especially as presses get faster every year. Watch it here:

And if you’re in category 4, drop us a line at info@globalgraphics.com, or, if you’re already a Harlequin OEM partner, our support team are ready and waiting for your questions.

Further reading:

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September 28, 2021April 5, 2022

Working with spot colors in Harlequin Core

Whenever we start working with a company who’s interested in using Harlequin Core™ for their Digital Front End (DFE), there are always three technical topics under discussion: speed, quality and capabilities. Speed and quality are often very quick discussions; much of the time they’ve approached us because they’re already convinced that Harlequin can do what they need. In the remaining cases we tend to jointly agree that the best way for them to be convinced is for them to take a copy of Harlequin Core and to run their own tests. There’s nothing quite like trying something on your own systems to give yourself confidence in the results.

So that leaves capabilities.

If the company already sells a DFE using a different core RIP they will almost always want to at least match, and usually to extend, the functionality of their existing solution when they switch to Harlequin. And if they’re building their first DFE they usually have a clear idea of what their target market will need.

At that stage we start by ensuring that we all understand that Harlequin Core can deliver rasters in whatever format is required (color channels, interleaving, resolution, bit depth, halftoning) and then cover color management pretty quickly (yes, Harlequin uses ICC profiles, including v4 and DeviceLink; yes, you can chain multiple profiles in arbitrary sequences, etc).

Then we usually come on to a series of questions that boil down to handling spot colors:

Most spot separations in jobs will be emulated on my digital press; can I adjust that emulation?
Can I make sure that the emulation works well with ICC profiles for different substrates?
Can I include special device colorants, such as White and Silver inks in that emulation?
Can I alias one spot separation name to another?
Can I make technical separations, like cut and fold lines, completely disappear, without knocking out if somebody upstream didn’t set them to overprint?
Alternatively, can I extract technical separations as vector graphics to drive a cutter/plotter with?

Since the answer to all of those is ‘yes’ we can then move on to areas where the vendor is looking for a unique capability …

But I’ve always been slightly disappointed that we don’t get to talk more about some of the interesting corners of spot handling in Harlequin. So I created a video to walk through some examples. Take a look, and I’d welcome your comments and questions!

Further reading:

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August 19, 2021August 19, 2021

Head, inks, substrates – don’t forget the software!

Martin Bailey, distinguished technologist at Global Graphics Software, chats to Marcus Timson of FuturePrint in this episode of the FuturePrint podcast. They discuss Martin’s role in making standards work better for print so businesses can compete on the attributes that matter, and software’s role in solving complex problems and reducing manual touchpoints in workflows.

They also discuss the evolution of software in line with hardware developments over the last few years, managing the increasing amounts of data needed to meet the demands of today’s print quality, the role of Global Graphics Software in key market segments and more.

Listen in here:

Head, ink and substrates, don't forget the software. A FuturePrint podcast with Martin Bailey

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July 21, 2021July 28, 2021

Digital press data rates – and why they matter

Following his post last week about the speed and scalability of your raster image processor, in this film, Martin Bailey, distinguished technologist at Global Graphics Software, explains how to determine how much raster image processor (RIP) power you need to drive a digital press by calculating the press data rate. It’s the best way of calculating how much RIP power you need in the Digital Front End (DFE) to drive it at engine speed and to ensure profitable printing.

Further reading:

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July 15, 2021September 8, 2022

Speed and Scalability: two things to consider when choosing a RIP for your digital inkjet press

If you’re building a digital press, or a digital front end (DFE) to drive a digital press, you want it to be as efficient and cost-effective as possible. As the trend towards printing short runs and personalization grows, especially in combination with increasing resolutions, more colorants and faster presses, the speed and scalability of the raster image processor (RIP) inside that DFE are key factors in determining profitability.

For your digital press to print at speed you’ll need to understand the amount of data that it requires, i.e. its data rate. In this film, Martin Bailey, distinguished technologist at Global Graphics Software, explains how different stages in data handling will need different data rates and how to integrate the appropriate number of RIP cores to generate that much data without inflating the bill of materials and DFE hardware.

Martin also explains that your next press may have a much higher data rate requirement than your current one.

For more information about the Harlequin Core visit: www.globalgraphics.com/harlequin

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June 30, 2021July 15, 2021

HP PageWide Industrial raises the bar with the Harlequin RIP

In this latest case study, Tom Bouman, worldwide workflow product marketing manager at HP PageWide Industrial, explains why the Harlequin RIP®, with its track record for high quality and speed and its ability to scale, was the obvious choice to use at the heart of its digital front end when the division was set up to develop presses for the industrial inkjet market back in 2008.

Today, the Harlequin RIP Core is at the heart of all the PageWide T-series presses, driving the HP Production Elite Print Server digital front end. Presses range from 20-inch for commercial printing, through to the large 110-inch (T1100 series) printers for high-volume corrugated pre-print, offering a truly scalable solution that sets the standard in performance and quality.

Read the full story here.

Further reading:

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