So what exactly is a Digital Press anyway?
The word “digital” has been bandied about to such an extent in the printing industry, that I’m not sure it has any meaning whatsoever anymore. In the broadest sense, digital printing could be described as any print process that begins with a computer file and ends up on some sort of imaged substrate. This runs the gamut from the $80 Canon inkjet on your desktop (that rapidly consumes ink cartridges worth their weight in gold) to the most sophisticated devices made by Xerox, HP/Indigo or a host of others.
The phrase “digital press” is definitely in. Many of the manufacturers dub their higher end production machines with this moniker. Easily 95% of the digital presses in the marketplace today simply aren’t. Let me explain that . . . they are digital, they aren’t presses. The “press” part of the nomenclature comes from the root word “pressure.” In the case of an offset press, there is actually pressure between the blanket cylinder and the impression cylinder that causes ink to set off (ergo “offset”) onto the paper. Not so with the digital press. For the most part, digital presses are toner devices. Mechanically, they are more akin to a copy machine than a press.
Poor Richard is, admittedly, a reformed offset press snob. For a long while, I referred to our color machines as “color copiers on steroids.” We started with a beast from Canon. It was digital in the sense that you could send a file to it. It worked on the principal of a rotating drum. Each sheet of paper went around the drum 4 times with a different color toner applied each revolution. The result was usually fairly consistently horrendous from one sheet to the next and absolutely unpredictable on consecutive days or if the weather changed. It would run 24# bond at the astounding rate of 6 sheets/minute.
But times have changed. The Xerox monster we have today runs almost any smooth stock at 10 times the rated speed of the Canon beast. Unlike it’s predecessors, it is very receptive to all kinds of files and color modes (RGB, CMYK, Spot). Ever so grudgingly, I even have to admit that the quality is every bit as good as offset. Maybe it’s even a little bit better.
Today I spent a half hour scoring and folding one of the prettiest digital press pieces we have ever produced. A trifold on 100# text with heavy ink coverage, it was designed by one of our university customers. The design was beautiful, but it would have been a bear to print on a press. The front featured a heavy orange solid that had to match up to the reverse. This is the kind of stuff that causes pressmen to go cross-eyed bonkers. We would have wasted 1000 sheets of paper to produce the 1000 brochures that were ordered. As it was, we ran 40 extras digitally for binding waste. The results were spectacular.
With all that said, there are still a few elements that need to be taken into consideration when designing for digital printing. Here are Poor Richard’s tips:
- Watch the solids. Big solids that can be a problem on press can also be a problem when they are printed digitally. Depending on the device, solids can fade, stripe, or ghost. The Xerox monster we’re running now really does a wonderful job on solids and is operator-friendly enough so that we can change a belt or drum when a problem occurs. This isn’t the case with all of the digital presses on the market or with all of the human beings that operate them.
- Watch the gradients. This problem is sporadic, but there is a more pronounced tendency for gradients to show banding when they are printed digitally. Light screens may also occasionally print unpredictably.
- Use a consistent color model. I really like the color gamut that our monster produces from RGB files. It is bright and the color pops. It isn’t color accurate, though. Most of the toner devices are CMYK and (if calibrated properly) will emulate a spot color as closely as process color on a press. Beware: combinations of CMYK and RGB may yield some very surprising results. And WYSIWYG still isn’t . . . I’m sure that the photograph of the local news team that was sent to us for their Christmas Card looked wonderful on the monitor at the station, but they were all mellow yellow when they printed on our digital press. Be conscious of this and correct color just like you would for offset.
- About Color. Color accuracy on digital devices is still a little hit and miss and calibration is as much art as science. One disadvantage to digital presses is the “tweaking” of color. Unlike offset, there are no ink keys that can be used to dial in by eye. That said, if your printer manages and monitors color on their digital machines, colors should be pretty consistent (but not exact) from one project to the next.
Remember that calibrations and color profiles for digital presses are specific to both device and paper substrate and it is totally impractical for a printer to calibrate to every paper in existence. This means that color will shift slightly between paper stocks. Color may also shift slightly from day to day due to the peculiarities of the machine, even if it is calibrated regularly.
- Ask for a hard copy proof. One of the wonderful aspects of digital printing is that you can produce just one copy to look at. It’s not instantaneous, but it is possible. If your project is color sensitive, ask for a hard copy proof on the paper specified for the job.Don’t expect your printer to produce this for free, though. There is time and overhead involved every time a file is opened or transmitted to a device. Printers should and do charge for this.
- Think Downstream. If you’re printing a flat sheet, you’re safe. But if the printed piece you design will be folded, this might be a problem. As stated above, most digital presses are toner-based devices. The toner adheres to the paper, but “piles up” on the surface to a much greater extent than does offset ink. When folded, the toner tends to crack, producing a ragged edge at the fold. Ask your printer about this before you design. If they don’t have scoring equipment that is designed for digital printing, you probably need to adapt your design so that no solids will cross a fold line.
Rickie, our pressman, who’s had nearly 30 years running offset presses of some sort will occasionally pick up an aberration produced by our Xerox monster, wave it in the air, and yell for all the world to hear, “Job Security!” He then heads off to his press and wastes 300 sheets to dial in color for the next run. He has job security, but only because he’s cross-trained.
There will be a place for offset for the forseeable future. My generation likes to read stuff on paper and we’re not dead yet. Offset is extremely cost-effective for medium and long runs of a static product. There is no replacement for offset on the horizon when it comes to producing magazines, programs, books, etc.
But offset will never be able to produce variable data or images (the subject of a future post) or meet the economies of scale needed for the short and quick color runs that are required in today’s business environment. Digital quality continues to improve. The next digital press we buy will probably use a liquid toner and be able to print on textured substrates . . . the technology to do this is already available.
I love my offset presses, but to quote scripture, “Mene, Mene, tekel, parsin.” (Daniel 5:25) The writing is on the wall.