New GWG Specifications
New GWG Specifications
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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