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Raster Formats

As easy way to see if your PDF file contains vector or bitmap content is to magnify the drawing to more than 800%. If you see smooth curves and straight lines, it’s a vector file and the conversion results will be successful. If what you see on screen looks jagged, ragged or pixelated, it is a bitmap file and you will only be able to create a drawing template to aid in redrawing the file in your engineering application.

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There are two basic formats for graphics – vector and image. Vector graphics are made up of objects, lines, curves and text while images are made up of a collection of dots or pixels. Images are also referred to as bitmaps or rasters.

Visual Integrity can convert most PDF files into either vector or image formats. It’s important to know which is best for the job you are doing.

If you need to break a PDF file down into objects and text for editing, then you want to choose a vector format. The vector formats supported in our software are DXF, PDF, PS, EPS, SVG, WMF, EMF, CGM, HPGL and MIF.

If you do not need to edit the file and simply want a sharp copy to insert into a document or to publish on a web-site, you’ll want to go with image formats. The image formats that we support are TIFF, GIF, PNG, JPEG and BMP. If you will be printing the graphic on a laser or ink-jet printer, convert at 150 or 300 dpi (dots per inch) resolution. If publishing to a web-site, use 96 or 72 dpi is best for screen display. Keep in mind that the higher the dpi (resolution), the larger the file size. It’s best to use the lowest resolution which achieves the level of quality you want.

Note! Scanned images can not be transformed by vector mode into lines, text and other vector objects because they are not vector source files. Instead, you will get an exact replica of the PDF as an image that can be used as a tracing layer which aids in the duplication effort. To convert scanned images into vector objects, you need a special class of software called “raster to vector”.

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pdf2picture converts PDF files into bitmap images as well as WMF, the native vector graphics format for Microsoft Windows. All of the Microsoft Office applications, including PowerPoint and Visio allow import of a variety of graphic types using “Insert, Picture from File”. Depending on the jb, you’ll want to convert using either vector or image mode:

Vector Mode– If you want to edit text or modify the graphic, you’ll want to choose a vector format – either WMF or EMF. Once you have your scalable file, follow the instructions to insert it onto a slide as editable objects. If you notice any problems with the appearance of your text, please see our font troubleshooting tips for how to map them. The fonts defined in the original file may not be on the target system or have a slightly different name.

Image Mode – If you want a true replica of the original file and do not have a need to modify the information, then choose image mode (PNG, GIF, JPEG). It will create a smaller file with high-fidelity.

In pdf2picture, WMF or EMF should be chosen if any of the following are of primary importance:

  • scalability
  • editability
  • ability to magnify with losing sharpness

In the following case, image mode should be chosen when:

  • No further editing is required
  • Image will not be scaled up in size
  • An absolutely identical match is required
  • to lock or protect the information from editing or copying

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  • The image formats used on web sites are JPEG (or JPG), PNG and GIF. JPEG is best for images with many colors such as photos. GIF is best for line art, illustrations and drawings with limited color. PNG is the most versatile and can be used quite broadly on web-sites.
  • The image formats used in documents follow a similar rule. GIF, TIFF and PNG are best for images with fewer colors and JPEG is used for images with many colors such as photos. The best test is to use pdf2image to convert to a few different formats and then view them both on-screen and in print to see which gives you the desired result.
  • It’s also important to determine what formats your application can import. If the program you want to use only accepts BMP, then you need to convert to this format, even if it produces larger files than PNG.

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  • If you are generating images for use on web sites, convert at 72 dpi (dots per inch) or 96 dpi. These settings match screen resolution pixel for pixel for the best match and sharpest display.
  • For general office printing, choose 150 dpi. This will generate a crisp image with the smallest file size.
  • For office publishing and high quality laser printing, choose 300 dpi. The files will be larger but the images will be very clear.
  • For professional printing, choose 300 dpi – 1200 dpi. It’s best to ask your printer who will recommend the best resolution to match his equipment.

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