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Faqs

META FLY

It’s easy to tell whether your PDF file is a raster or vector format by viewing it in Adobe Acrobat.  This is important since the two file types are converted differently. Vector PDF files are best transformed through data extraction. This is accurate and precise and involves minimal manual clean-up. Raster PDF files are traced since there is no data to extract. This is an approximation and requires operator involvement as well as manual clean-up. Visual Integrity is specialized in tools for vector conversion and will produce high-quality, accurate drawings from vector PDF input. If a raster PDF or scanned drawing is run through our software, we will turn the flat image into a tracing layer for manual work-up.

Test #1 – The Blue Test

Start by opening your PDF file with Acrobat or Acrobat Reader. Click anywhere on the drawing. If it turns blue, it’s a scanned drawing. Depending on the quality of the scan, you may have some success with a raster-to-vector tool. Alternatives are to manually redraw it or outsource it to be redrawn by a service bureau.

scanned drawing-unselected

A scanned drawing as it opens on-screen in Acrobat (It has not yet been selected).

scanned drawing - selected

Once you click anywhere on the scanned drawing, the entire drawing is selected and turns blue to signify this.

 

Test #2 – The Zoom Test

Open your PDF file with Acrobat or Acrobat Reader. Use the Magnifying Control to zoom in on a detailed section of the file. At 100-150%, it may be hard to tell the difference. Continue zooming until you are at a magnification greater than 400%.

When magnified, a scanned drawing will look jagged, noisy, blurry or dirty. If you are uncertain, magnify some more. The higher the resolution of the drawing, the more magnification it needs to degrade. Vector files will look perfect at any resolution.

When magnified, a scanned drawing will look jagged, noisy, blurry or dirty. If you are uncertain, magnify some more. The higher the resolution of the drawing, the more magnification it needs to degrade. Vector files will look perfect at any resolution.

2. Zoom

The section of the picture should be magnified on your screen and it should become apparent whether you have a vector or raster PDF file. The Vector PDF file will look clear and smooth at any resolution while the raster PDF will become dirtier and grainier the more it’s zoomed. In the example below, the section is enlarged 400%. Sometimes, it’s necessary to magnify the file more than 1000% when it’s a high-res scan to determine the file type.

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If you are using a desktop product, there is a Help file included with the software. Just click on the Help button found in the bottom right corner of the software dialog. A new screen will open, with a table of content for all the available topics. You can expand the outline to find the section on Conversion Options or search the index using the Find command. Depending on which product you are using, there will be General Options, Page Options, Size Options and Format Specific Options.

For Developers – In the “docs” directory of the Conversion SDK installation, each option is explained in “options flysdk.pdf”. In addition to the description, for each option, the corresponding API function is listed.

For example:

rotate(0) STDAPI VgRotate(INT rotate)

rotate(0)               Rotate the drawing using the angle specified. Default = 0, no rotation.

 

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Converting multiple files is also called batch mode and all of our products support it. To specify more than one file, use the “Add” button. Once you have specified your first files, you can remove files and add files until you have the batch of files together that you want to convert.

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WMF, or Windows Metafile, is the original 16-bit metafile format. It is the native vector graphics format for the Microsoft Windows platform. It is also the standard format for scalable graphics in Microsoft Office and many other Windows applications. Even though it has been enhanced and extended as a 32-bit format (EMF -Enhanced Metafile), WMF is still the most widely used and supported metafile format on the Windows platform.

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Several vector formats such as WMF, CGM, DXF and HPGL do not support cropping. This is the act of cutting away and discarding the unnecessary portions of the picture such as extraneous fills and other elements. PDF and PostScript, both very robust and complete formats, do support it. To bridge the gap, Visual Integrity has developed a proprietary method to simulate cropping. When applied during conversion, the resulting file will appear cropped just like the original.

To apply it, select the “Emulate PS/PDF cropping” feature in the General tab of the Options menu.

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The font glyphs of the 13 standard PostScript fonts are included.

If you need to convert to an image format or the text to curves/polys (= emulate) in a vector format either the font must be one of the 13 standard fonts or the font should be embedded within the PDF or PostScript file. Contact support@visual-integrity.com if you want to add font glyphs.

13 Standard PostScript fonts:

  • Courier (Regular, Oblique, Bold, Bold Oblique)
  • Helvetica (Regular, Oblique, Bold, Bold Oblique)
  • Times (Roman, Italic, Bold, Bold Italic)
  • Symbol

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