PDF/X is a subset of the PDF ISO standard. The purpose of PDF/X is to facilitate graphics exchange, and it therefore has a series of printing related requirements which do not apply to standard PDF files. For example, in PDF/X-1a all fonts need to be embedded and all images need to be CMYK or spot colors. PDF/X-3 accepts calibrated RGB and CIELAB colors, while retaining most of the other restrictions of PDF/X-1a.

PDF/X files must not only follow certain restrictions, they also must contain a special file identification, inside the PDF, which says which PDF/X version they are. This means that a file can only conform to a single specific PDF/X standard, even if all other requirements are met.

The printing conditions or output intent need to be specified in the file. This can be specified in the form of standard profiles using codes, like "CGATS TR 001 SWOP".

In a PDF/X file that has color managed data each color managed graphic gets its own color profile, so even though the file as a whole is CMYK, individual graphics may be RGB (with calibration information).

Various boxes must be defined. The MediaBox which defines the size of the entire document, either the ArtBox or the TrimBox, which define the extent of the printable area. If the file is to be printed with bleed, a BleedBox, which must be larger than the TrimBox/ArtBox, but smaller than the MediaBox, must be defined.

Active content is not allowed in a PDF/X file. This means that standard PDF features like forms, signatures, comments and embedded sounds and movies are not allowed in PDF/X. Features that are forbidden in the PDF/X standard can sometimes be used, if they do not affect the rendering of the file. This allows for things like annotations outside the BleedBox.

PDF/X-6 is in development which will be the new print production standard built upon PDF 2.0.[1]

PDF/Exchange (Print production)
Filename extension.pdf
Internet media typeapplication/pdf
Type code'PDF ' (including a single space)
Magic number%PDF
Developed byISO
Initial release2001
Extended fromPDF
StandardISO 15930

List of the PDF/X standards

PDF/X is formalized in ISO standards 15929 and 15930:

  • ISO 15929 (which was withdrawn in March 2008 and no longer is an official standard) specifies the guidelines and principles for the development of PDF/X standards.
  • ISO 15930 defines the specific implementations:
    • ISO 15930-1:2001: PDF/X-1a:2001, blind exchange in CMYK + spot colors, based on PDF 1.3
    • ISO 15930-2: PDF/X-2, was never published.
    • ISO 15930-3:2002: PDF/X-3:2002, allows CMYK, spot, calibrated (managed) RGB, CIELAB, with ICC Profile, based on PDF 1.3.
    • ISO 15930-4:2003: PDF/X-1a:2003, revision of PDF/X-1a:2001 based on PDF 1.4
    • ISO 15930-5:2003: PDF/X-2, An extension of PDF/X-3 which allows for OPI-like (external linked) data to be included. It was withdrawn in 2011.
    • ISO 15930-6:2003: PDF/X-3:2003, revision of PDF/X-3:2002 based on PDF 1.4
    • ISO 15930-7:2008: PDF/X-4, Colour-managed, CMYK, gray, RGB or spot colour data are supported, as are PDF transparency and optional content. A second conformance level named PDF/X-4p may be used when the ICC Profile in the output intent is externally supplied. It is using PDF 1.6. A second edition with minor corrections and improvements (which does not change file identifications) is ISO 15930-7:2010.
    • ISO 15930-8:2008 PDF/X-5, with a second edition with minor corrections and improvements (which does not change file identifications) as ISO 15930-8:2010. It is using PDF 1.6. A collection of three conformance levels:
      • PDF/X-5g: An extension of PDF/X-4 that enables the use of external graphical content. This can be described as OPI-like (Open Prepress Interface) workflows. Specifically this allows graphics to be referenced that are outside the PDF, which "can have value in reducing... demands... by allowing... work with low resolution" [ISO-15930-8:2010].
      • PDF/X-5pg: An extension of PDF/X-4p that enables the use of external graphical content in conjunction with a reference to an external ICC Profile for the output intent.
      • PDF/X-5n: An extension of PDF/X-4p that allows the externally supplied ICC Profile for the output intent to use a color space other than Grayscale, RGB and CMYK.

File identifications

All versions of PDF/X contain file identifications which indicate the version of PDF/X to which they conform. This appears in a document info dictionary, in document metadata, or both, according to the standard used. As of 2010, the complete list of file identifications are the following strings: PDF/X-1:2001, PDF/X-1a:2001, PDF/X-1a:2003, PDF/X-3:2002, PDF/X-3:2003, PDF/X-4, PDF/X-4p, PDF/X-5g, PDF/X-5pg. Observe that this means that the various revisions of PDF/X-1a and PDF/X-3 are distinct types, while the revisions to PDF/X-4 and PDF/X-5 variations are not.

See also


  1. ^ "What PDF 2.0 Will Mean for the Printing Industry". whattheythink.com. Retrieved 4 April 2018.

External links

Apache FOP (Formatting Objects Processor)

Formatting Objects Processor (FOP, also known as Apache FOP) is a Java application that converts XSL Formatting Objects (XSL-FO) files to PDF or other printable formats.

FOP was originally developed by James Tauber who donated it to the Apache Software Foundation in 1999. It is part of the Apache XML Graphics project.

FOP is open source software, and is distributed under the Apache License 2.0.

Automotive X Prize

The Progressive Insurance Automotive X PRIZE (PIAXP or AXP) was a set of competitions, programs and events, from the X Prize Foundation, to "inspire a new generation of super-efficient vehicles that help break America's addiction to oil and stem the effects of climate change." Progressive Insurance was the title sponsor of the prize, the centerpiece of which is the Competition Division, within which a 10-million-dollar purse was divided between the winners of three competitions.

The essence of each competition was to design, build and race super-efficient vehicles that achieved 100 MPGe (2.35 liter/100 kilometer) efficiency, produced less than 200 grams/mile well-to-wheel CO2 equivalent emissions, and could be manufactured for the mass market. Within the Competition Division, there are two vehicle classes: Mainstream and Alternative. The mainstream class had a prize of $5 million. The alternate class had two separate prizes of $2.5 million, one for side-by-side seating and one for tandem seating.The PIAXP has an Educational Program, funded by a $3.5 million grant from the United States Department of Energy, to engage students and the public in learning about advanced vehicle technologies, energy efficiency, climate change, alternative fuels, and the science, technology, engineering, and math behind efficient vehicle development.

Balding–Nichols model

In population genetics, the Balding–Nichols model is a statistical description of the allele frequencies in the components of a sub-divided population. With background allele frequency p the allele frequencies, in sub-populations separated by Wright's FST F, are distributed according to independent draws from

where B is the Beta distribution. This distribution has mean p and variance Fp(1 – p).

The model is due to David Balding and Richard Nichols and is widely used in the forensic analysis of DNA profiles and in population models for genetic epidemiology.

Corel Ventura

Ventura Publisher was the first popular desktop publishing package for IBM PC compatible computers running the GEM extension to the DOS operating system. The software was originally developed by Ventura Software, a small software company founded by John Meyer, Don Heiskell, and Lee Jay Lorenzen, all of whom met while working at Digital Research. It ran under an included run-time copy of Digital Research, Inc.'s Graphics Environment Manager (GEM).

The first version of Ventura Publisher was released in 1986.

Ventura Publisher was distributed worldwide exclusively by Xerox from its first shipment in 1986 until Ventura Software sold the source code to Xerox in 1990. The original Ventura Software ceased operations in February 1990, and a new Ventura Software Inc. was formed at that time, an affiliated company of Xerox. The developers from the original company worked with the new Xerox Ventura Software company to produce Version 3.0 Gold. This was released in late 1990. Besides DOS/GEM, it was also available for Win16, Mac, and OS/2.

The three founders of the original Ventura Software no longer worked on the product after November 1990.

Version 4.0 was released in 1991. The last version released by Ventura Software Inc. was 4.1.1 in 1993.

Ventura Publisher had some text editing and line drawing capabilities of its own, but it was designed to interface with a wide variety of word processing and graphics programs rather than to supplant them. To that end, text was stored in, loaded from, and saved back to word processor files in the native formats of a variety of word processors, including WordPerfect, Wordstar, and early versions of Microsoft Word, rather than being incorporated into the chapter files. This allowed users to continue using their favorite word processors for major text changes, spelling checks, and so forth. Paragraphs other than default body text were tagged with descriptive tagnames that were entirely user-defined, and characters and attributes that have no native equivalent in a given word processor were represented with standardized sequences of characters. When working with the files outside of Ventura Publisher, these paragraph tags and special character and attribute codes could be freely changed, the same as any other text. These tags looked very much like HTML tags.

Ventura Publisher was the first major typesetting program to incorporate the concept of an implicit "underlying page" frame, and one of the first to incorporate a strong "style sheet" concept. It produced documents with a high degree of internal consistency, unless specifically overridden by the user. Its concepts of free-flowing text, paragraph tagging, and codes for attributes and special characters anticipated similar concepts inherent in HTML and XML. Likewise, its concept of "publication" files that tie together "chapter" files gave it the ability to handle documents hundreds (or even thousands) of pages in length as easily as a four-page newsletter.

The major strengths of the original DOS/GEM edition of Ventura Publisher were:

Its ability to run, with reasonable response times, on a wide range of hardware (including 8086 and 80286-based computers)

Its ability to produce, by default, documents with a high degree of internal consistency

Its automatic re-export of text to word-processor-native formats

Its ability to print to a wide variety of devices, including PostScript, PCL, and InterPress laser printers and imagesetters, as well as certain popular dot-matrix printers.The application was acquired by Corel in 1993. It was repackaged and soon released as Corel Ventura 4.2 without any major change in the application, other than to drop all support for platforms other than Microsoft Windows.

The first real Corel version was 5.0, released in 1994, and made fundamental changes to both user interface and document structure. Because of this, and because of escalating requirements of the various Corel versions, the original DOS/GEM edition still has a small number of die-hard users.

The application was rewritten for the Win32 platform and was released in 1996, labeled Corel Ventura 7 (instead of 6) so that it would match the version number of CorelDRAW. Corel Ventura 8 was released in 1998.

Corel Ventura 10

The latest version (as of November 2018) is Corel Ventura 10 (2002), this version runs in Windows 10 (x86/64) with compatibility mode (XP) and copy "mfc42.dll" in programs corel folder (for 64 bit Windows). Also run over linux ubuntu 18.10 / wine, inclusive in live USB mode. Output in PDF/X-1 and others standar modes.

As an application with strengths in more structured documents, its main competitors are FrameMaker, InDesign and QuarkXPress.

Gini coefficient

In economics, the Gini coefficient ( JEE-nee), sometimes called Gini index, or Gini ratio, is a measure of statistical dispersion intended to represent the income or wealth distribution of a nation's residents, and is the most commonly used measurement of inequality. It was developed by the Italian statistician and sociologist Corrado Gini and published in his 1912 paper Variability and Mutability (Italian: Variabilità e mutabilità).The Gini coefficient measures the inequality among values of a frequency distribution (for example, levels of income). A Gini coefficient of zero expresses perfect equality, where all values are the same (for example, where everyone has the same income). A Gini coefficient of 1 (or 100%) expresses maximal inequality among values (e.g., for a large number of people, where only one person has all the income or consumption, and all others have none, the Gini coefficient will be very nearly one). However, a value greater than one may occur if some persons represent negative contribution to the total (for example, having negative income or wealth). For larger groups, values close to or above 1 are very unlikely in practice. Given the normalization of both the cumulative population and the cumulative share of income used to calculate the Gini coefficient, the measure is not overly sensitive to the specifics of the income distribution, but rather only on how incomes vary relative to the other members of a population. The exception to this is in the redistribution of income resulting in a minimum income for all people. When the population is sorted, if their income distribution were to approximate a well-known function, then some representative values could be calculated.

The Gini coefficient was proposed by Gini as a measure of inequality of income or wealth. For OECD countries, in the late 20th century, considering the effect of taxes and transfer payments, the income Gini coefficient ranged between 0.24 and 0.49, with Slovenia being the lowest and Chile the highest. African countries had the highest pre-tax Gini coefficients in 2008–2009, with South Africa the world's highest, variously estimated to be 0.63 to 0.7, although this figure drops to 0.52 after social assistance is taken into account, and drops again to 0.47 after taxation. The global income Gini coefficient in 2005 has been estimated to be between 0.61 and 0.68 by various sources.There are some issues in interpreting a Gini coefficient. The same value may result from many different distribution curves. The demographic structure should be taken into account. Countries with an aging population, or with a baby boom, experience an increasing pre-tax Gini coefficient even if real income distribution for working adults remains constant. Scholars have devised over a dozen variants of the Gini coefficient.

ICC profile

In color management, an ICC profile is a set of data that characterizes a color input or output device, or a color space, according to standards promulgated by the International Color Consortium (ICC). Profiles describe the color attributes of a particular device or viewing requirement by defining a mapping between the device source or target color space and a profile connection space (PCS). This PCS is either CIELAB (L*a*b*) or CIEXYZ. Mappings may be specified using tables, to which interpolation is applied, or through a series of parameters for transformations.

Every device that captures or displays color can be profiled. Some manufacturers provide profiles for their products, and there are several products that allow an end-user to generate his or her own color profiles, typically through the use of a tristimulus colorimeter or preferably a spectrophotometer.

The ICC defines the format precisely but does not define algorithms or processing details. This means there is room for variation between different applications and systems that work with ICC profiles. Since late 2010, the current version of the specification is 4.3.ICC has also published a preliminary specification for iccMAX, a next-generation color management architecture with significantly expanded functionality and a choice of colorimetric, spectral or material connection space.


iText is a library for creating and manipulating PDF files in Java and .NET.

iText was written by Bruno Lowagie. The source code was initially distributed as open source under the Mozilla Public License or the GNU Library General Public License open source licenses. However, as of version 5.0.0 (released Dec 7, 2009) it is distributed under the Affero General Public License version 3. A fork of the LGPL/MPL licensed version of iText is currently actively maintained as the OpenPDF library on GitHub. iText is also available through a proprietary license, distributed by iText Software NV.

iText provides support for most advanced PDF features such as PKI-based signatures, 40-bit and 128-bit encryption, color correction, Tagged PDF, PDF forms (AcroForms), PDF/X, color management via ICC profiles and barcodes, and is used by several products and services, including Eclipse BIRT, Jasper Reports, JBoss Seam, Windward Reports, and pdftk.

List of PDF software

This is a list of links to articles on software used to manage Portable Document Format (PDF) documents. The distinction between the various functions is not entirely clear-cut; for example, some viewers allow adding of annotations, signatures, etc. Some software allows redaction, removing content irreversibly for security. Extracting embedded text is a common feature, but other applications perform optical character recognition (OCR) to convert imaged text to machine-readable form, sometimes by using an external OCR module.


The Portable Document Format (PDF) is a file format developed by Adobe in the 1990s to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems. Based on the PostScript language, each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, vector graphics, raster images and other information needed to display it. PDF was standardized as an open format, ISO 32000, in 2008, and no longer requires any royalties for its implementation.Today, PDF files may contain a variety of content besides flat text and graphics including logical structuring elements, interactive elements such as annotations and form-fields, layers, rich media (including video content) and three dimensional objects using U3D or PRC, and various other data formats. The PDF specification also provides for encryption and digital signatures, file attachments and metadata to enable workflows requiring these features.


PDF/A is an ISO-standardized version of the Portable Document Format (PDF) specialized for use in the archiving and long-term preservation of electronic documents. PDF/A differs from PDF by prohibiting features unsuitable for long-term archiving, such as font linking (as opposed to font embedding) and encryption. The ISO requirements for PDF/A file viewers include color management guidelines, support for embedded fonts, and a user interface for reading embedded annotations.


ISO 24517-1:2008 is an ISO Standard published in 2008.

Document management—Engineering document format using PDF—Part 1: Use of PDF 1.6 (PDF/E-1)This standard defines a format (PDF/E) for the creation of documents used in geospatial, construction and manufacturing workflows and is based on the PDF Reference version 1.6 from Adobe Systems. The specification also supports interactive media, including animation and 3D.

PDF/E is a subset of PDF, designed to be an open and neutral exchange format for engineering and technical documentation.


PDF/VT is an international standard published by ISO in August 2010 as ISO 16612-2. It defines the use of PDF as an exchange format optimized for variable and transactional printing. Built on top of PDF/X-4, it is the first variable-data printing (VDP) format which ensures modern International Color Consortium-based (ICC) color management through the use of ICC Output Intents. It adds the notion of encapsulated groups of graphic objects to support optimized efficient processing for repeating text, graphic or image content. Introducing the concept of document part metadata (DPM), it enables reliable and dynamic management of pages for High Volume Transactional Output (HVTO) print data, like record selection or postage optimizaton based on metadata.

While PDF/VT-1 always consists of a self-contained file, other variants of the standard support the use of external graphic content (PDF/VT-2) as well as streaming through the use of multi-part MIME packages (PDF/VT-2s). In addition to being a digital master for VDP printing, it can be shared, viewed and interactively navigated by human operators using a normal PDF reader, though completely accurate rendering requires a PDF/X-4 or PDF/VT conforming viewer.

A number of vendors announced their support for PDF/VT upon publication of the standard in 2010. Over the subsequent few years various other PDF/VT-consuming and -producing products also reached the market:

PDF/VT producer: The vendor PDFlib joined the ranks of producing vendors in April 2011 with PDFlib 8 VT Edition which is able to generate valid PDF/VT data. The vendor PrintSoft (now Objectif Lune) since late 2013 provides PReS 6.3.0 which is able to generate valid PDF/VT data.

PDF/VT validator: callassoftware has upgraded its Pre-flight (printing) application "pdfToolbox" version 5 with the option to check for PDF/VT conformity.

PDF/VT consumers: Adobe have upgraded their Raster image processor software Adobe PDF PrintEngine (APPE) to add support for efficient PDF/VT processing. APPE is embedded and built into many high speed printers made by different vendors. Global Graphics have supported PDF/VT in their Harlequin RIP since v8.2, which was launched at Ipex in April 2010 by Hewlett-Packard in the DFE driving the Indigo Digital Press.The ubiquity of PDF, as well as the fact that PDF itself now is an ISO standard (ISO 32000-1:2008) clearly work in favor of PDF/VT. Nevertheless, it is currently difficult to predict where in the industry PDF/VT will be adopted and how fast that will happen, and how it will be positioned vis-à-vis other formats and architectures for variable data printing.

The practical requirements and benefits of PDF/VT are explained in more detail, along with related recommendations, in a guide from Global Graphics.

Preview (macOS)

Preview is the image viewer and PDF viewer of the macOS operating system; it enables users to view and print digital images and Portable Document Format (PDF) files. Preview uses Apple's implementation of the PDF specification, the Aqua graphical user interface, the Quartz graphics layer, and the ImageIO and Core Image frameworks.

Punta de Chimino

Punta de Chimino is a Maya archaeological site in the Petexbatún region of the department of Petén in Guatemala. Occupation at the site dates to the Preclassic and Classic periods of Mesoamerican chronology. Punta de Chimino experienced a population surge in the Late Preclassic, followed by a reduction in occupation levels in the Early Classic and another increase in the Terminal Classic when the city became one of the few population centres to survive the political disintegration of the Petexbatún region after the collapse of the kingdom based at Dos Pilas. The neighbouring city of Seibal on the Pasión River appears to have intervened at Punta de Chimino at this time and to have politically dominated the smaller site.


QuarkXPress is a desktop publishing software for creating and editing complex page layouts in a WYSIWYG (What You See Is What You Get) environment. It runs on macOS and Windows. It was first released by Quark, Inc. in 1987 and is still owned and published by them.

The most recent version, QuarkXPress 2018 (internal version number, allows publishing in English ("International and U.S.") and 36 other languages, including Arabic, Chinese, Japanese, Portuguese, German, Korean, Russian, French, and Spanish.QuarkXPress is used by individual designers, large publishing houses and corporates to produce a variety of layouts, from single-page flyers to the multi-media projects required for magazines, newspapers, catalogs, and the like. The more recent versions have added support for ebooks, Web and mobile apps.


Scribus is a desktop publishing (DTP) application using the Qt visual toolkit and released under the GNU General Public License as free software. There are native versions available for Unix, Linux, BSD, macOS, Haiku, Microsoft Windows, OS/2 and eComStation operating systems. Many free programs are included in this DTP package.Scribus is designed for layout, typesetting, and preparation of files for professional-quality image-setting equipment. It can also create animated and interactive PDF presentations and forms. Example uses include writing newspapers, brochures, newsletters, posters, and books.

Books about Scribus are available in several languages, including an official manual for v1.3, published through FLES Books in 2009.

Surf Air

Surf Air is a California-based commuter airline that offers unlimited flight service for a fixed monthly fee. The company uses Pilatus PC-12 aircraft.Surf Air provides commuter services in California, Texas, and Western Europe.


Tagged Image File Format, abbreviated TIFF or TIF, is a computer file format for storing raster graphics images, popular among graphic artists, the publishing industry, and photographers. TIFF is widely supported by scanning, faxing, word processing, optical character recognition, image manipulation, desktop publishing, and page-layout applications. The format was created by Aldus Corporation for use in desktop publishing. It published the latest version 6.0 in 1992, subsequently updated with an Adobe Systems copyright after the latter acquired Aldus in 1994. Several Aldus or Adobe technical notes have been published with minor extensions to the format, and several specifications have been based on TIFF 6.0, including TIFF/EP (ISO 12234-2), TIFF/IT (ISO 12639), TIFF-F (RFC 2306) and TIFF-FX (RFC 3949).


Xlapak (or Xlapac) is a small Maya archaeological site in the Yucatan Peninsula of southeastern Mexico. It is located in the heart of the Puuc region, about 4 kilometres (2.5 mi) from the archaeological site of Labná and a similar distance from Sayil, lying directly between the two sites. It consists of three main groups in a valley of the Puuc Hills in Yucatán State, a region of karst limestone forming the only major topographical feature of the peninsula. The closest town is Oxkutzcab, about 30 kilometres (19 mi) to the northeast.

The site dates from the Late to Terminal Classic periods and was sited in an area suitable for agriculture.Restoration at Xlapak, and other nearby archaeological sites, was carried out in the first half of the 20th century by the Mexican Instituto de Antropologia e Historia (Institute of Anthropology and History). Further archaeological investigation was carried out in 1965 under the direction of César A. Sáenz.

ISO standards by standard number

This page is based on a Wikipedia article written by authors (here).
Text is available under the CC BY-SA 3.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.