PDF to DWG? I did not know we were there yet.
I would be fascinated to learn what that package costs.
How does it handle line weights?
if it can do raster to vector and handle line weights converted to DWG,
then I can sort to produce layers by line weight.
which is something I had never considered.
overcome those hurdles and SCALE is small potatoes. isn't it?
The PDF printer driver may or may not pick up line weights - depends on
settings. I prefer to convert to polylines with defined widths - seems to
be more reliable. Most PDF to DXF/DWG converters I've tried can't convert
polylines properly; even high end Adobe Illustrator needs widths reduced
to zero, or it creates a chain of polygons. So I prefer this method to
prevent people ripping off my stuff :-)
line weights are part of plotter configuration in autocad, yes.
PDF is an output file, which I believe is RASTOR.
autocad thinks in vectors, and plots in raster.
to create a dwg file from a raster file of ANY sort, all manner of
interpretation must be done.
dots >>> vectors
for example, what is the exact endpoint, to 16 point accuracy, of a
bunch of dots that happen to look like a line when printed?
different type of data.
PDF is not a vector file.
it is RASTOR.
and autocad is a database which CAN produce pictures.
but producing a database from an image is not possible.
you may have programs which approximations.
but you have lost everything you cannot see, and only approximated what
you could see.
the weekend is upon us.
Let's see, you want to take a print of a drawing (that's what a PDF is)
and turn it into a properly scaled DWG file?
And how is the software supposed to know what scale the drawing was
printed at? And how is the software supposed to know what the layer names
are and which lines go on which layer?
There is a for PDF's. That's so people can't "easily" copy the
information and turn it into a drawing without the original owner's
permission. If you want a DWG file then call the original owner and ask
Bob Morrison, PE, SE
R L Morrison Engineering Co
I find this quite a useful thing to be able to do - especially when
wanting to go back and forth between 3d isometrics and photoshop, for
instance. A utility within a program called CorelDraw has given me
superb results in the past - but I can't recall if it's part of the
main package or an add-on.
I've used Scan2CAD for fairly simple drawings, but found it was easier to
redraw if the dimensions were labelled.
The problem is that a PDF is not the same drawing in a different file
format, but a _representation_ of the drawing.
You won't be able to recover the accuracy of a map grid, with x,y
coordinates like 471639.3040,7857914.46777 - because they aren't there any
more. Same with nurbs,
To quell the debate - PDF's can be either vector or raster (objects or
pdf2cad (www.pdf2cad.com) is a tool to convert PDF to DXF (open CAD
interchange format) which can be opened in AutoCAD and saved as DWG.
If the files do not convert into CAD objects, the original PDF is
probably a scanned drawing. pdf2cad is designed to only convert PDF
files which were generated as scalable files from an application.
Scanned drawings are reduced to bitmap images. To convert these, you
need a different class of software called raster-to-vector. An example
is Scan2CAD (http://www.softcover.com/cgi-bin/at.cgi?aB1325 )
Many people find they need both types of tools. Converting directly
from a scalable PDF to DXF is ideal since you maintain the geometric
integrity. However, sometimes the only possibility is to "trace" a
scanned drawing using raster-to-vector software or even redraw it by
For more information on vector vs. raster files, please see the
following tips on the Visual Integrity web site:
Can I convert a scanned PDF into a vector file?
Learn how to tell the difference between raster and vector PDF files
If you want to send a sample file so to confirm whether it is a bitmap
image, please do to email@example.com. The web link above offers
some tips on how to do this yourself using the magnifying glass in
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