Statistical graphics for publication – Statistical graphics for publication – easy ways to meet requirements for easy ways to meet requirements for

high resolutionhigh resolution

Jim FlewellingJim FlewellingGrowth Model Users GroupGrowth Model Users Group

February 11, 2008February 11, 2008

OUTLINEOUTLINE Resolution specificationsResolution specifications Advice: Ignore the specificationsAdvice: Ignore the specifications Graphics Files & SoftwareGraphics Files & Software Create and View Bitmaps Create and View Bitmaps ReferencesReferences

Learn from my mistakes!

Resolution SpecificationsResolution Specifications

The preferred resolution of all graphs (when printed) is 600 to 1200 dots per inch; the minimum acceptable resolution is 300 dpi.

Advice (short and sweet)Advice (short and sweet)

“If you are producing an EPS file, you don’t need to pay attention to dpi at all.”“dpi is a completely misleading term”. It refers to how many pixels per inch are used in printing.

- Systat Software Inc.

Problem and AdviceProblem and Advice Graphics software often has unstated Graphics software often has unstated

resolution.resolution. Output file types with stated resolution Output file types with stated resolution

may be as low as 96 dpi.may be as low as 96 dpi. Use vector output formats (no resolution):Use vector output formats (no resolution):

Encapsulated postscript (.eps)Encapsulated postscript (.eps) Enhanced Metafile (.emf)Enhanced Metafile (.emf)

Use scalable fonts (preferably postscript).Use scalable fonts (preferably postscript). Convert to TIFF only if needed.Convert to TIFF only if needed.

Example with SPSS 15SPSS output (can be edited or exported)

.eps dropped into .eps dropped into PowerPointPowerPoint

SPSS created bitmap (.bmp)SPSS created bitmap (.bmp)

.eps converted to 600 dpi .eps converted to 600 dpi bitmapbitmap

Windows metafile or SPSS direct paste would look the same.

Conversion Software Conversion Software (.eps to .bmp or .tiff)(.eps to .bmp or .tiff)

PhotoshopPhotoshop (Expensive, compresses) (Expensive, compresses)

GSviewGSview is a graphical interface for Ghostscript under is a graphical interface for Ghostscript under MS-Windows, OS/2 and GNU/Linux. Ghostscript is an MS-Windows, OS/2 and GNU/Linux. Ghostscript is an interpreter for the PostScript page description interpreter for the PostScript page description language used by laser printers. language used by laser printers.

MS PAINTMS PAINT can be used to view the bitmap files. can be used to view the bitmap files.

Or Or COPYCOPY .eps file to PS printer; use magnifying glass. .eps file to PS printer; use magnifying glass.

Gsview (Ghostgum Gsview (Ghostgum Software)Software)

Converts PostScript or PDF to bitmaps, PostScript or PDF. Converts PostScript or PDF to bitmaps, PostScript or PDF.

Extracts a range of pages to be copied from a PostScript document. Extracts a range of pages to be copied from a PostScript document.

PS to EPS allows the bounding box to be updated and allows the header to be changed from PS to PS to EPS allows the bounding box to be updated and allows the header to be changed from PS to EPS. EPS.

EPS Preview adds a bitmap preview to an EPS file. (publisher may require this)EPS Preview adds a bitmap preview to an EPS file. (publisher may require this)

Extracts the PostScript or Preview from a DOS EPS file. Extracts the PostScript or Preview from a DOS EPS file.

Edit | Convert to vector format uses pstoedit to convert PostScript or PDF to an editable vector Edit | Convert to vector format uses pstoedit to convert PostScript or PDF to an editable vector format. format.

Edit | Text Extract uses pstotext to extract text from a PostScript or PDF document. Edit | Text Extract uses pstotext to extract text from a PostScript or PDF document.

Edit | Copy copies the display bitmap to the clipboard. Edit | Paste To copies a clipboard DIB bitmap Edit | Copy copies the display bitmap to the clipboard. Edit | Paste To copies a clipboard DIB bitmap to a file. to a file.

Edit | Convert Bitmap converts a clipboard DIB bitmap to a clipboard device dependent bitmap. Edit | Convert Bitmap converts a clipboard DIB bitmap to a clipboard device dependent bitmap.

ReferencesReferences

SYSTAT - SIGMAPLOT. SYSTAT - SIGMAPLOT. www.systat.com/products/sigmaplot/?sec=1102www.systat.com/products/sigmaplot/?sec=1102

SAS TS-674. Introduction to exporting SAS/Graph output to SAS TS-674. Introduction to exporting SAS/Graph output to Microsoft office.Microsoft office.Support.sas.com/techsup/technote/ts674/ts674.htmlSupport.sas.com/techsup/technote/ts674/ts674.html

Elsevier “for authors” file formatsElsevier “for authors” file formatswww.elsevier.com/wps/find/authorsview.authors/file_formatwww.elsevier.com/wps/find/authorsview.authors/file_formatss

Ghostview. Ghostview. pages.cs.wisc.edu/~ghost/gsview/ pages.cs.wisc.edu/~ghost/gsview/

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