GWG v4 versus 2011

gwg.org

GWG v4 versus 2011

GWG v4 versus GWG2011

Elli Cloots

Enfocus, an EskoArtwork Company


New naming convention

• Now

• MagazineAds_1v4

• Next

§

GWG2011_MagazineAds_x4

• New variant

§

GWG2011_MagazineAds_ICC_x4


Variants

Now

• MagazineAds_1v4

• NewspaperAds_1v4

• SheetCmyk_1v4

• SheetSpotHiRes_1v4

• SheetSpotLoRes_1v4

• SheetSpotVeryHiRes_1v4

New

GWG2011_MagazineAds_x4 (& ICC)

GWG2011_NewspaperAds_x4 (& ICC)

GWG2011_SheetCmyk_x4 (& ICC)

GWG2011_SheetSpot_x4 (& ICC)

• ScreenPrintCmyk_1v4

• ScreenPrintSpot_1v4

• WebCmykHiRes_1v4

• WebCmykNews_1v4

• WebSpotHiRes_1v4

• WebSpotNews_1v4

GWG2011_WebCmyk_x4 (& ICC)

GWG2011_WebCmykNews_x4

GWG2011_WebSpot_x4


Basis

• Now: PDF/X-1a:2001

• Next: PDF/X-4:2010

• Why?

§ Live transparency

§ Color-managed / ICC based workflows

§ Layers / optional content

§ Request from users


Enfocus, an EskoArtwork Company

PDF/X-1a versus PDF/X-4


PDF/X-1a versus PDF/X-4

• Many file-technical aspects remained the

same

• Trailer shall have an ID

• No LZW

• No Encryption

• No PS

– No PS Xobjects

– No PS operators

• Referenced Xobjects

• No undefined operators

• Not HTP in ExtGState

• No Actions


PDF/X-1a versus PDF/X-4

• Print-technical aspects that stayed the same

§ Output intent

§ Not pre-separated

§ No image alternates

§ No TR or TR2 in ExtGState

§ Halftone type = 1 or 5

§ All fonts embedded

§ All glyphs used are present

§ No annotations inside BleedBox


PDF/X-1a versus PDF/X-4

• Print-technical aspects that stayed the same

§ No Actions

§ Trapping

• Shall indicate Trapped status

• Trapnet Annotations

§ Trim or ArtBox (not both)


PDF/X-1a versus PDF/X-4

PDF/X-1a

• PDF 1.3

• Only CMYK, Gray of

Separation

• No transparency

• No layers (yet)

PDF/X-4

• PDF 1.6

• Device independent color

also used

• Transparency allowed

• Layers allowed (is no AS)

• Overprint rules

• Extra font checks

§

§

§

Glyph widths

TrueType encoding

.notdef


PDF/X-1a versus PDF/X-4

• New in PDF/X-4

§ XMP rules

§ No external streams

• Including no OPI

§ Complies with implementation limits

§ Rendering intent requirements

§ DeviceN & Nchannel requirement

§ JBIG2 allowed

§ Embedded files allowed

§ CreationDate, ModDate and Title not required


PDF/X-1a versus PDF/X-4

• New in PDF/X-4

§ No Crypt filters

§ Only UR and/or UR3 (Doc perms)

§ No alternate presentations

§ No interactive forms (XFA key)

§ JPEG2000 compression

• According to JPX spec


Enfocus, an EskoArtwork Company

GWG v4 versus GWG2011


GWG v4 versus GWG2011

• Major changes

§ Based on PDF/X-4 in stead of PDF/X-1a

§ Classic & ICC based delivery method

§ Transparency allowed

• Extra checks for transparency blend color space

§ Optional content allowed (Layers)

• Not for MagazineAds and NewspaperAds

§ Total Ink Coverage

§ XMP = well-formed XML

§ Proof of Preflight signature


GWG v4 versus GWG2011

• Added

§ DeviceGray

• Small black text can not be DeviceGray

• Thin black lines can not be DeviceGray

§ Overprint

• Thin black lines (DeviceCMYK) must overprint OPM=1

§ ICC v2 profiles (not higher)

§ Single Image Page: min resolution


GWG v4 versus GWG2011

• Updated

§ Output intent: update of recommended profiles

§ Overprint

• Grayscale: excluding small black text in DeviceGray

• Black Text: OPM must equal 1

§ Spot Color Naming

• No longer specific for Pantone

§ Ambiguous Spot Color

• Partially covered by PDF/X4

• i.e. same name, different alternates


GWG v4 versus GWG2011

• Updated

§ “Effective line width” (1/multiple colorants)

• Incl. Stroke & Fill

• Incl. rectangular objects

§ Image resolution

§ Removed maximum


GWG v4 versus GWG2011

• Dropped

§ File encoding & compression

§ Objects off the page

§ Halftone Function

§ OpenType fonts

§ Font embedding (see PDF/X-4)

§ Font Widths (see PDF/X-4)

§ 16-bit images

§ Annotations (see PDF/X-4)


GWG v4 versus GWG2011

• Stayed the same

§ No page scaling factor

§ Crop Box must equal Media Box

§ Page Size and Orientation

§ Empty pages

§ Number of Pages

§ Overprint White Text

§ Overprint White Paths

§ No Font Courier

§ Rich Black Text


GWG v4 versus GWG2011

• Stayed the same

§ Small text (1/multiple colorants)

§ Use of Spot Color

§ Separation All


Enfocus, an EskoArtwork Company

Questions?

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