Problems converting PNG image to SVG with autotrace

Hi,
I am trying to convert a large number of color PNG images of hieroglyphs (produced after much effort) to SVG format, using "autotrace -background-color ffffff -output-format svg".
It seems that where there are closed paths with background color inside, autotrace produces an SVG image with the background area in black instead of transparency. (You can see the images at http://5b4az.chronos.org.uk/pkg/hieroglyph/A001.png and http://5b4az.chronos.org.uk/pkg/hieroglyph/A001.svg although the svg image is not rendered by Firefox). You may also download the tarballs with all the hieroglyphs of the Gardiner set if you are interested.
After all the effort that went into these images, I am stuck with being unable to convert raster images to vector graphics. I did try autotrace before I put in all this effort, but I didn't notice the problem because apparently I tried it on images with no enclosed background color.....
Any suggestions wellcome greatefully!
Last edited by neok (2009-10-17 16:59:31)

I know this is an old thread, but I did some new testing on some line art and want to post my results.
I started with a PNG, and converted it to PBM and PGM. I got much better quality doing this conversion with GIMP, as opposed to pngtopnm.
I traced both formats with autotrace and potrace, which I output to SVG.
Autotrace accepts PNG, so I did the trace with the original as well.
I got the highest quality with PGM and potrace. It also was the smallest file size.
a close second was PBM with potrace, slightly larger.
third was autotrace and the PBM, larger still.
Using the PGM with autotrace was unacceptable, and the file size was HUGE!
So if black/white is OK: Convert PNG to PGM with GIMP, then potrace
both the best quality, and smallest size SVG. This is assuming you started with anti-aliased black/white line-art, i guess the full greyscale PGM avoids the aliasing of PBM.
It seems autotrace is the way to go, if your forced to deal with multiple colors.
I suspect you will need to do many passes and really tweak those command options,
The PNG directly to autotrace was a complete disaster, but i suspect it would improve given enough time to configure command arguments.
However, even with those perfect options I would believe potrace yields a cleaner trace.

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Hi
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"mariosal026" <[email protected]> wrote in
message
news:ea3nq2$9ol$[email protected]..
> Hey Guys
>
> I am new to dynamic development but I already did some
research and
> tutorials
> about how to get a dynamic web site working with PHP and
Mysql in
> Dreamweaver.
> I set up a test page to view some content on it directly
from the mysql
> database and it worked just fine in dreamweaver only
when I pressed the
>
live
> data view.
>
> When I tried to view the same page using the browser
preview with firefox
> and
> internet explorer, plain text from the database was
correctly displayed on
> the
> brower but the images were absent.
>
> In the mysql database I used the varchar as my picture
data type field so
> that
> I will refer in dreamweaver in the data binding panel in
the img.src to
> the
> picture column of my database.
>
> I anyone can tell me what am I doing wrong so that my
pictures are not
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preview facility in
> dreamweaver I would be very very and very pleased ! :)
>

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Hi Friends!
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