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New GWG Specifications

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<strong>Specifications</strong><br />

Elli Cloots<br />

Co-chair Specification Subcommittee<br />

Vice-chair


First a few questions…<br />

• Who has heard of the <strong>GWG</strong><br />

specifications?<br />

• Who uses the current v4 specifications?<br />

• Who uses a PDF/X-1a workflow?<br />

• Who uses a PDF/X-4 workflow?<br />

• Who will go to PDF/X-4 in the<br />

next year?


Current specification<br />

v4


Variants<br />

• MagazineAds_1v4<br />

• <strong>New</strong>spaperAds_1v4<br />

• ScreenPrintCmyk_1v4<br />

• ScreenPrintSpot_1v4<br />

• SheetCmyk_1v4<br />

• SheetSpotHiRes_1v4<br />

• SheetSpotLoRes_1v4<br />

• SheetSpotVeryHiRes_1v4<br />

• WebCmykHiRes_1v4<br />

• WebCmyk<strong>New</strong>s_1v4<br />

• WebSpotHiRes_1v4<br />

• WebSpot<strong>New</strong>s_1v4


General<br />

• Based on PDF/X-1a:2001<br />

− Based on PDF 1.3<br />

• CMYK, Gray or Spot only<br />

• No Device independent colors<br />

• No transparency<br />

• No layers


<strong>GWG</strong> checks (all variants)<br />

• File encoding & compression<br />

• Crop Box must equal Media Box<br />

• No objects off the page<br />

• No page scaling factor<br />

• No halftone function<br />

• No transparency<br />

• No fully embedded OpenType fonts<br />

• All fonts must be embedded<br />

• Font widths


<strong>GWG</strong> checks (all variants)<br />

• No font Courier<br />

• Overprint rules<br />

− Small black text must overprint<br />

− Grayscale objects<br />

− White text & line art<br />

• Separation All<br />

• 16-bit images<br />

• Layers<br />

• Use of annotations


<strong>GWG</strong> checks (diff. variants)<br />

• Page size and orientation<br />

• Empty pages<br />

• Number of pages<br />

• Ink coverage<br />

• Spot color naming & use<br />

• Ambiguous spot colors<br />

• Recommended ICC profiles for Output intent<br />

• Small text<br />

• Line weight<br />

• Image resolution


Coming next<br />

<strong>GWG</strong>2011


Why change?<br />

• Life transparency<br />

• Color-managed / ICC based workflows<br />

• Layers / optional content<br />

• Requests from users and associations


Variants (draft names)<br />

• <strong>GWG</strong>2011_MagazineAds_x4<br />

• <strong>GWG</strong>2011_MagazineAds_ICC_x4<br />

• <strong>GWG</strong>2011_<strong>New</strong>spaperAds_x4<br />

• <strong>GWG</strong>2011_<strong>New</strong>spaperAds_ICC_x4<br />

• <strong>GWG</strong>2011_SheetCmyk_x4 *no more high/veryhighres<br />

• <strong>GWG</strong>2011_SheetCmyk_ICC_x4<br />

• <strong>GWG</strong>2011_SheetSpot_x4<br />

• <strong>GWG</strong>2011_SheetSpot_ICC_x4<br />

• <strong>GWG</strong>2011_WebCmyk_x4<br />

• <strong>GWG</strong>2011_WebCmyk_ICC_x4<br />

• <strong>GWG</strong>2011_WebCmyk<strong>New</strong>s_x4<br />

• <strong>GWG</strong>2011_WebCmyk<strong>New</strong>s_ICC_x4<br />

• <strong>GWG</strong>2011_WebSpot_x4<br />

• <strong>GWG</strong>2011_WebSpot_ICC_x4


General<br />

• Based on PDF/X-4:2010<br />

− Based on PDF 1.6<br />

• No longer CMYK, Gray or Spot only<br />

• Allows device independent color<br />

• Transparency allowed<br />

• Layers allowed (except for Ads)


<strong>GWG</strong> checks (1)<br />

• Added<br />

− Extra checks for transparency blend color space<br />

− DeviceGray<br />

• Small black text can not be DeviceGray<br />

• Thin black lines can not be DeviceGray<br />

− Overprint<br />

• Thin black lines (DeviceCMYK) must overprint OPM=1<br />

− ICC v2 profiles (not higher)<br />

− Single Image Page: min resolution


<strong>GWG</strong> checks (2)<br />

• Updated<br />

− Output intent: update of recommended profiles<br />

− Overprint<br />

• Grayscale: excluding small black text in DeviceGray<br />

• Black Text: OPM must equal 1<br />

− Spot Color Naming<br />

• No longer specific for Pantone<br />

− Ambiguous Spot Color<br />

• Partially covered by PDF/X-4<br />

• i.e. same name, different alternates


<strong>GWG</strong> checks (3)<br />

• Updated<br />

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

• Incl. Stroke & Fill<br />

• Incl. rectangular objects<br />

− Image resolution<br />

• Removed maximum<br />

− Definition of Black objects


Dropped<br />

• File encoding & compression<br />

• Objects off the page<br />

• Halftone Function<br />

• OpenType fonts<br />

• Font embedding (see PDF/X-4)<br />

• Font Widths (see PDF/X-4)<br />

• 16-bit images<br />

• Annotations (see PDF/X-4)


More?


www.gwg.org<br />

• Technical Content<br />

− <strong>Specifications</strong><br />

• Download<br />

− Application settings<br />

• Stay informed<br />

• Interact


Questions?<br />

Thank You!

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