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HPGL

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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If the PDF file contains characters, pdf2cad will convert them and map them as MTEXT objects in the DXF file. Unfortunately, when creating a PDF file from a CAD drawing, the text is not always retained. Sometimes it is “plotted” as pen strokes or turned into curves. When this happens, the character definition is lost. There is nothing that pdf2cad can do about this – it can only reproduce the curves (=SPLINES entities) in the DXF file. What looks like text in the original file may actually just be an object, comprised of a series of pen strokes that looks like a letter.

Tip: to see if the text in your PDF drawing is live and searchable, open the PDF file in Acrobat (Reader) and use the Text Select tool. If you cannot highlight any words, the text is already outlined to curves. If a PDF file contains searchable text, pdf2cad will reproduce it as MTEXT in the DXF file, preserving the fonts and styles.
Tip: To create a PDF with searchable text from AutoCAD, make sure to use TrueType fonts in the drawing and ensure that your printer driver is set to retain text as text instead of converting it to curves.  Text can be lost in either of these two steps in creating a PDF file. See how to create a PDF file with searchable text from CAD Digest.
Tip: if your PDF files contain non-Roman font text (such as Chinese, Arabic or Cyrillic), or if the text looks garbled in the DXF output, try using the “Convert characters to curves” option in the General tab of the Options menu of pdf2cad. This outlines the text during conversion to ensure WYSIWYG rendering (not editable).

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