New GWG Specifications

gwg.org

New GWG Specifications

Specifications

Elli Cloots

Co-chair Specification Subcommittee

Vice-chair


First a few questions…

• Who has heard of the GWG

specifications?

• Who uses the current v4 specifications?

• Who uses a PDF/X-1a workflow?

• Who uses a PDF/X-4 workflow?

• Who will go to PDF/X-4 in the

next year?


Current specification

v4


Variants

• MagazineAds_1v4

NewspaperAds_1v4

• ScreenPrintCmyk_1v4

• ScreenPrintSpot_1v4

• SheetCmyk_1v4

• SheetSpotHiRes_1v4

• SheetSpotLoRes_1v4

• SheetSpotVeryHiRes_1v4

• WebCmykHiRes_1v4

• WebCmykNews_1v4

• WebSpotHiRes_1v4

• WebSpotNews_1v4


General

• Based on PDF/X-1a:2001

− Based on PDF 1.3

• CMYK, Gray or Spot only

• No Device independent colors

• No transparency

• No layers


GWG checks (all variants)

• File encoding & compression

• Crop Box must equal Media Box

• No objects off the page

• No page scaling factor

• No halftone function

• No transparency

• No fully embedded OpenType fonts

• All fonts must be embedded

• Font widths


GWG checks (all variants)

• No font Courier

• Overprint rules

− Small black text must overprint

− Grayscale objects

− White text & line art

• Separation All

• 16-bit images

• Layers

• Use of annotations


GWG checks (diff. variants)

• Page size and orientation

• Empty pages

• Number of pages

• Ink coverage

• Spot color naming & use

• Ambiguous spot colors

• Recommended ICC profiles for Output intent

• Small text

• Line weight

• Image resolution


Coming next

GWG2011


Why change?

• Life transparency

• Color-managed / ICC based workflows

• Layers / optional content

• Requests from users and associations


Variants (draft names)

GWG2011_MagazineAds_x4

GWG2011_MagazineAds_ICC_x4

GWG2011_NewspaperAds_x4

GWG2011_NewspaperAds_ICC_x4

GWG2011_SheetCmyk_x4 *no more high/veryhighres

GWG2011_SheetCmyk_ICC_x4

GWG2011_SheetSpot_x4

GWG2011_SheetSpot_ICC_x4

GWG2011_WebCmyk_x4

GWG2011_WebCmyk_ICC_x4

GWG2011_WebCmykNews_x4

GWG2011_WebCmykNews_ICC_x4

GWG2011_WebSpot_x4

GWG2011_WebSpot_ICC_x4


General

• Based on PDF/X-4:2010

− Based on PDF 1.6

• No longer CMYK, Gray or Spot only

• Allows device independent color

• Transparency allowed

• Layers allowed (except for Ads)


GWG checks (1)

• Added

− Extra checks for transparency blend color space

− 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 checks (2)

• 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/X-4

• i.e. same name, different alternates


GWG checks (3)

• Updated

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

• Incl. Stroke & Fill

• Incl. rectangular objects

− Image resolution

• Removed maximum

− Definition of Black objects


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)


More?


www.gwg.org

• Technical Content

Specifications

• Download

− Application settings

• Stay informed

• Interact


Questions?

Thank You!

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