Composition of Digital Printing Systems and Comparative Analysis with Traditional Printing | Digital Printing vs. Printing
Composition of a Digital Printing System
A digital printing system functions as an integrated whole. The input of the system is digital information, and the output is printed products. A digital printing system consists of a system control center, digital printing presses, binding and cutting units, as well as various management software. All operations and functions can be preset according to requirements and then automatically completed by the system. The diagram below shows an example of a digital printing system configuration.
The source of digital information for the system may come from digital files or images transmitted via networks, information transferred from prepress systems, or other digital storage media. Furthermore, the types of digital printing products are diverse. They may include commercial printed materials, publications, trademarks, cards, and packaging products, covering a very broad range of fields.
Comparison Between Digital Printing and Traditional Printing
At present, digital printing is gradually replacing traditional offset printing. From a development perspective, digital printing demonstrates significant advantages compared with traditional printing, mainly reflected in the following aspects:
1. Workflow
▲ Traditional printing workflow:
Prepress processing → Four-color film output → Proofing → Plate exposure → Plate processing → Plate mounting → Machine adjustment and test run → Ink-water balance → Printing → Printed products
▲ Digital printing workflow:
Prepress processing → Printing → Printed products
Compared with traditional offset printing operations, digital printing has a simpler process. In the traditional printing workflow, the original manuscript is created by computer, color-separated films are output, proofing is performed, imposition is completed, PS plates are exposed, plates are mounted, and four-color printing is carried out. There are many processes before and after printing. If problems such as dot loss or color misregistration occur during these stages, partial or complete rework may be required.
In contrast, the digital printing process requires only two procedures: computer preparation of the original manuscript and printing. The operation is simple and integrates design and printing into one process. No films or printing plates are required, and there is no issue of ink-water balance. Generally, one person can complete the entire printing process.
2. Print Quantity
Traditional printing methods involve expensive plate-making costs, making them unsuitable for short-run printing. Generally, sheet-fed color offset printing is rarely used for print runs of fewer than 3,000 copies. Printing methods such as gravure or flexographic printing are typically used to produce millions of identical printed products.
For example, on a web offset or gravure press, printing a 200-page full-color brochure can cost less than one dollar per copy. However, to achieve this price, more than one million copies must be produced. Therefore, short-run printing has long been one of the biggest challenges in traditional printing. Printing companies typically prefer orders of more than 3,000 copies.
This is because the cost and time of film output and plate making, as well as press setup time, make it difficult to provide smaller quantities at prices acceptable to customers. In the past, if a customer needed 500 copies, one offset solution was to pay for 3,000 copies but only take 500 copies. This drawback forced many potential customers to choose photocopying or abandon printing altogether. Examples include annual reports for small organizations, production manuals for low-output manufacturers, professional magazines and books, and community newspapers—all typical short-run printing businesses.
Digital printing is a perfect solution to this demand. Digital presses can output prints without press setup and produce almost no waste. They can print from a single copy, making them extremely economical for very short runs. In addition to short-run advantages, digital printing also demonstrates clear benefits in printing jobs that require frequent content updates.
3. Variable Data Printing
Unlike traditional printing technologies, digital printing allows 100% variation in image content from one sheet to another, providing higher flexibility. Digital printing enables modification of information between each printed piece, allowing completely different products to be output for each customer, thereby achieving variable data printing.
4. Shortened Proofing Time
For conventional short-run printing, films and plates must be produced, and offset printing requires relatively long machine setup time. For these reasons, offset presses generally require several hours before production begins.
Because digital presses do not require films, plates, or press setup, their startup adjustment time usually takes only about 10 minutes.
5. Distribution and Printing
In traditional offset printing, publications are printed at a single printing plant and then transported to the final destination required by users. This is known as the “print-then-distribute” model. The disadvantage of this method is that nationwide or global distribution requires significant time and transportation costs.
With digital printing, publications can be conveniently and economically sent to multiple digital presses for local printing. After the file is processed through RIP, it can be printed locally and then distributed. In many cases, this “distribute-then-print” approach saves considerable time and money compared with the traditional “print-then-distribute” production model.
6. Printing Operation
Digital printing is relatively simple and requires less labor. Particularly when switching from one job to another, it is only necessary to load the corresponding electronic file for printing. Unlike traditional offset printing, there is no need to change plates or clean blankets.
Digital printing is easier to learn, and many processes are digitally controlled. The requirement for operator experience is relatively lower compared with traditional offset printing, which takes a long time to train skilled operators. However, in terms of overall professional competence, digital printing demands broader skills. A qualified digital printing operator must understand printing, mechanical systems, computer technology, electronics, and English to troubleshoot daily issues.
7. Post-Press Processing
In terms of post-press processing, digital printing can automatically impose pages according to the selected binding method, printing books one by one without the need for collation, saving time and labor. Products are dry immediately after coming out of the machine and can proceed directly to post-press processing.
Compared with traditional printing, digital printing offers a higher degree of automation in post-press processing, which can be automatically controlled through preset configurations.
Existing Limitations of Digital Printing
1. Printing Quality Comparison
Overall, digital printing still does not match traditional offset printing in precision. Its limitations mainly include:
▲ Fine lines and tonal gradation:
For designs containing extremely fine lines such as anti-counterfeiting background patterns, digital printing may produce blurring, and the overall tonal layering may appear insufficient.
▲ Highlight reproduction:
In highlight areas (such as skin tones in portraits), digital printing may lose halftone dots, resulting in abrupt color transitions and noticeable banding between highlight and darker areas. This is especially evident in facial rendering. Slightly reducing facial brightness may improve visual results.
▲ Solid tint uniformity:
When printing large solid tint areas (especially multi-color overprints), digital printing may produce uneven color banding (horizontal or vertical streaks). Using textured or patterned background designs can effectively mask this defect.
2. Paper Requirements
Digital printing has more complex and diverse paper requirements:
▲ Strong technical dependency:
Different digital printing technologies (imaging methods) have specific requirements for paper properties such as coating, conductivity, and heat resistance. Some technologies even require specialized papers.
▲ Cost factor:
Most mainstream digital printing equipment manufacturers provide recommended paper lists, and these papers are generally more expensive than those commonly used in traditional printing.
Digital Printing vs. Printing
In the Chinese context, the terms “printing” (印刷) and “printing” (打印) are often used interchangeably, yet they actually carry different industrial connotations. In a broad sense, “printing” typically refers to large-scale, industrialized reproduction processes carried out in factory environments using professional equipment such as offset presses, producing outputs that meet traditional high standards for printed materials. In contrast, “printing” more commonly refers to small-batch, desktop-level output using home or office-grade equipment, with relatively flexible specifications and lower costs.
With the rapid penetration of digital technology, a key question has emerged: Should Digital Printing and Printing be clearly distinguished? And how should their boundaries be defined? A closer examination of the evolution of digital printing reveals that its roots are deeply embedded in early printing and copying technologies. This shared technological origin makes it difficult to draw a strict dividing line between the two. In a sense, it was the development of desktop printing technology that paved the way for the prosperity of modern digital printing. Fundamentally, a digital printing press can be regarded as a high-performance, industrial-grade printer, as both share the same core task: precisely transferring ink (liquid or toner) onto a substrate. The differences lie more in output size, production speed, quality consistency, and large-scale production capacity.
At present, there is no unified or authoritative industry standard for distinguishing between the two. In practice, differentiation often relies on experiential consensus. Based on technical literature, identification can generally be made according to the following key parameters:
1. Resolution and Imaging Precision
Digital printing systems typically provide a base resolution of 600 dpi or higher. More importantly, to achieve smooth tonal transitions (such as grayscale gradients and rich color layers), they commonly employ multi-level pixel rendering technologies (as shown in the figure below). This means that a single physical pixel can present a wide range of tonal variations through precise control of ink droplet size, quantity, or placement. In comparison, mainstream color printers—especially office-grade models—often operate at resolutions around 300 dpi, with relatively limited tonal reproduction capability.
2. Production Throughput Capacity
The core value of digital printing systems lies in efficiency. A commonly referenced benchmark defines digital printing as the ability to stably output at least 1,500 four-color, A4-size pages per hour (single-sided). If a device’s productivity falls significantly below this threshold, it is more likely to be classified as a digital proofing system or a high-performance digital office printer/copier.
Beyond these quantitative indicators, there are several notable differences between digital presses and conventional printers in daily applications:
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Output Quality:
Modern digital presses have reached a highly mature level of imaging quality. In terms of color accuracy, detail reproduction, and uniformity, they can rival—or even surpass—certain traditional offset printing standards. Ordinary printers, particularly in color output, typically have a lower performance ceiling compared to professional printing equipment. -
Cost at Scale:
As print volume increases, the cost per page for printers—especially color printers—rises sharply due to rapid consumption of consumables (ink cartridges/toner). Digital presses, by contrast, utilize optimized consumable systems (such as high-capacity ink tanks or toner reservoirs) and high-efficiency engines. Under equivalent print areas, black-and-white printing costs can be only a fraction of those of desktop printers, while color printing costs may be reduced to just a few fractions of printer costs. -
Speed and Stability:
Digital presses not only offer higher engine speeds but also deliver far superior stability and durability under continuous, high-intensity operation—capabilities that ordinary printers cannot match. This reliability is essential for large-scale production. -
Duplex Printing Efficiency:
Mainstream digital presses widely support one-pass duplex printing, significantly improving productivity. In contrast, most desktop printers require two passes to complete double-sided printing. -
Media Compatibility:
Printers generally have limited media compatibility, mainly supporting specific paper types and weights, with only a few models accommodating specialty films. Digital presses, however, can handle a much broader range of substrates, including specialty papers, cardstock, synthetic materials, and even certain textiles, offering far greater adaptability.
It must be emphasized that rapid technological advancement and evolving market demands continue to reshape traditional perceptions. On one hand, the emergence of high-speed production printers has pushed output capacity and reliability far beyond the scope of conventional office printing, approaching or even matching entry-level digital presses. On the other hand, advanced color digital printing devices—especially those employing high-quality inkjet or electronic ink technologies—have achieved output quality comparable to offset presses in specific applications.
This overlap in performance has made the absolute boundary between “printing” and “printing” increasingly blurred. Equipment classification today depends more on its deployment context (industrial environment vs. office environment) and its core design objective (large-scale production vs. on-demand flexible output).