View source for PDFX

== PDF/X ==

This text is a first draft and will give you only the basic information
needed to create PDF/X compatible documents.
More info will be made available at a later date.

First things first. The following parameter should be set for any PDF/X version.

<texcode>
\setupinteraction
  [title=TITLE,
   subtitle=SUBTITLE,
   author=AUTHOR,
   keyword={{KEYWORD1, KEYWORD2}, KEYWORD3}]
</texcode>

Coming to the quite simple interface.

<texcode>
\setupbackend
  [format=valid pdf/x name,
   profile=name.icc,
   intent=name.icc,
   level=compresslevel, % default 3
   file=optional specification file,
   option=always|never]
</texcode>


The two parameter <tt>format</tt> and <tt>intent</tt> are sufficient for most cases.

The <tt>format</tt> parameter simply defines the '''PDF/X version''',
while the <tt>intent</tt> parameter sets the so called '''output intent'''.

Currently the following PDF/X versions are supported:

<code>format =</code>

<texcode>
                                               gray  rgb  cmyk  spot  transp. notes
PDF/X-1a:2001  % PDF Version 1.3 (Acrobat 4.x) *          *     *     
PDF/X-1a:2003  % PDF Version 1.4 (Acrobat 5.x) *          *     *     
PDF/X-3:2002   % PDF Version 1.3 (Acrobat 4.x) *     *    *     *
PDF/X-3:2003   % PDF Version 1.4 (Acrobat 5.x) *     *    *     * 
PDF/X-4        % PDF Version 1.6 (Acrobat 7.x) *     *    *     *     *    PDF layers
PDF/X-4p       % PDF Version 1.6 (Acrobat 7.x) *     *    *     *     *    PDF layers; ICC externally supplied
PDF/X-5g       % PDF Version 1.6 (Acrobat 7.x) *     *    *     *     *    PDF layers; graphics can be outside pdf
PDF/X-5n       % PDF Version 1.6 (Acrobat 7.x) *     *    *     *     *    PDF layers; ICC externally supplied
PDF/X-5pg      % PDF Version 1.6 (Acrobat 7.x) *     *    *     *     *    PDF layers; p + g
</texcode>

* PDF/X-1 uses device dependent colors, i.e. your pictures must be converted into the output color space (gray or CMYK).
* PDF/X-3+ uses device '''in'''dependent colors, i.e. the color space of your pictures doesn’t matter, but it must be defined by a color profile.
* It makes no sense to use CMYK pictures with PDF/X-3+, because color conversions between CMYK profiles are more lossy than any RGB-to-CMYK conversion!
* It makes sense to use PDF/X-1a:2003 for bw printing.
* Even if they’re allowed in X/4+, don’t use PDF layers for print projects – your printshop will not be able to handle them.

Predefined output intents:

<code>intent =</code>
    Coated FOGRA39 (ISO 12647-2:2004)
    GRACoL2006_Coated1v2.icc
    ISO Coated v2 300% (ECI)
    ISO Coated v2 (ECI)
    ISOnewspaper26v4
    ISOnewspaper26v4_gr
    ISO Uncoated
    ISO Uncoated Yellowish
    ISO Web Coated
    Japan Color 2001 Coated
    Japan Color 2002 Newspaper
    Japan Web Coated (Ad)
    SNAP 2007
    SWOP2006_Coated3v2.icc
    SWOP2006_Coated5v2.icc
    Uncoated FOGRA29 (ISO 12647-2:2004)
    Web Coated FOGRA28 (ISO 12647-2:2004)
    PSR_LWC_PLUS_V2_PT
    PSR_LWC_STD_V2_PT
    PSR_SC_PLUS_V2_PT
    PSR_SC_STD_V2_PT
    PSRgravureMF

'''Which one to use?'''
* In Europe, use FOGRA profiles.
* In the USA, use SWOP profiles.
* In Japan, use Japan profiles.
* Use Coated for image printing paper.
* Use Uncoated for natural paper (e.g. "offset").
* "Web" means "web offset", i.e. big volume printing from a roll of paper (vs. sheet paper).


Some examples:

<texcode>\setupbackend
  [format=PDF/X-1a:2001,
   intent=SWOP2006_Coated3v2.icc]
</texcode>

or

<texcode>\setupbackend
  [format=PDF/X-4,
   intent={ISO Coated v2 300\letterpercent\space (ECI)}]
</texcode>


'''All remaining parameter are kind of special.'''

<tt>profile</tt>
sets the ICC based default color space profile (option for color management);
this setting is document wide and currently only one profile
per color space is allowed

<tt>level</tt>
sets the PDF compress level (values of 0..9 are allowed). Normally no need to change the
default value.

<tt>option=always|never</tt>
    <tt>always</tt>: force embedding of the output intent profile (useful only in case of PDF/X-1a)
    <tt>never</tt> : don't embed the output intent profile; no useful practise

<tt>file</tt> 
name of an external file with predefined color profiles

== ICC profiles ==

The predefined color profiles can be found in
<tt>.../<context-path>/colors/icc/context/colorprofiles.xml|.lua.</tt>

This list contains the profiles recommended by the [http://www.gwg.org GWG] (Ghent PDF Workgroup) in 2008,
the set of profiles bundled with [http://pages.cs.wisc.edu/~ghost/ ghostscript]
and three test only profiles from the [http://www.color.org ICC] (International Color Consortium).

''' Ghent PDF Workgroup (GWG) recommendations: '''
* [http://dl.contextgarden.net/misc/iccprofiles/GWG_recommended_ICC_profiles_v13.pdf 2008 version]
* [https://gwg.org/technical-specifications/gwg-2015-specifications/ 2015 version] (no profiles mentioned)

There are a few contradictions to the PDF/X standards (by [https://www.pdfa.org PDF Association]) to assure a better quality, see the [https://www.pdfa.org/further-quality-requirements-pdfx-plus/ article by Stephan Jaeggi].

Nearly all predefined ICC profiles are also available in the download section.
Output intents are bound to very specific printing conditions (which vary worldwide),
so it’s very likely that you only need one or two ICC profiles (and not all of them).
Therefore the profile ZIPs come in 'localized' versions.

GWG recommend ICC profiles 
[http://dl.contextgarden.net/misc/iccprofiles/GWG_recommended_ICC_profiles.zip (complete)]
[http://dl.contextgarden.net/misc/iccprofiles/GWG_recommended_ICC_profiles_Europe.zip (Europe)]
[http://dl.contextgarden.net/misc/iccprofiles/GWG_recommended_ICC_profiles_India.zip (India)]
[http://dl.contextgarden.net/misc/iccprofiles/GWG_recommended_ICC_profiles_Japan.zip (Japan)]
[http://dl.contextgarden.net/misc/iccprofiles/GWG_recommended_ICC_profiles_USA.zip (USA)]

Probe profiles (external link):
[http://www.color.org/probeprofile.xalter here]

Ghostscript profiles:
[http://dl.contextgarden.net/misc/iccprofiles/ghostscript_ICC_profiles.zip here]

All predefined profiles in one
[http://dl.contextgarden.net/misc/iccprofiles/complete_ICC_profiles.zip zip] file



'''Profile installation:'''

The profiles are normally stored under

    .../<context-path>/colors/icc/profiles

All profiles in the zip archive are already located in the correct sub path,
so you only have to unpack them right in your ConTeXt directory
(normally `texmf-context`).

In case you use these profiles also with other software, it is
possible to share them with ConTeXt. Simply set the environment
variable '''$ICCPROFILES''' to that special software related directory.

E.g. for Adobe Acrobat on Windows Vista this special directory is

    C:\Program Files (X86)\Common Files\Adobe\Color\Profiles\Recommended

Store the needed profiles there (without any TeX directory) and
set $ICCPROFILES to that path.

On MacOS use `~/Library/ColorSync/Profiles` for your own profiles; the following setup makes sense in `.bashrc` or `.profile`:

    export ICCPROFILES="~/Library/ColorSync/Profiles//:/System/Library/ColorSync/Profiles//:/Library/Application Support/Adobe/Color/Profiles//:"
    # /Library/ColorSync/Profiles// doesn’t contain anything useful

The double slashes at the end mean “all subdirectories”.

All you need now is a final <tt>mtxrun --generate</tt> to update the file database.

In case of problems you should add

<texcode>\enabletrackers[backend.pdfx]

\setupbackend[...
</texcode>

right in front of {{cmd|setupbackend}} to get
all possible debugging info.

And that’s it for the moment...

[[Category:PDF]]
[[Category:Tools]]