How to convert a PNG image to a SVG? [closed]

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How to convert a PNG image to a SVG?

回答1:

There is a website where you can upload your image, and see the result.

http://vectormagic.com/home

But if you want to download your svg-image, you need to register. (If you register, you get 2 images for free)

回答2:

potrace does not support PNG as input file, but PNM.
Therefore, first convert from PNG to PNM:

convert file.png file.pnm        # PNG to PNM
potrace file.pnm -s -o file.svg  # PNM to SVG

Explain options

• potrace -s => Output file is SVG
• potrace -o file.svg => Write output to file.svg

Example

Input file = 2017.png

convert 2017.png 2017.pnm

Temporary file = 2017.pnm

potrace 2017.pnm -s -o 2017.svg

Output file = 2017.svg

Script

ykarikos proposes a script png2svg.sh that I have improved:

#!/bin/bash

File_png="${1?:Usage: $0 file.png}"

if [[ ! -s "$File_png" ]]; then
  echo >&2 "The first argument ($File_png)"
  echo >&2 "must be a file having a size greater than zero"
  ( set -x ; ls -s "$File_png" )
  exit 1
fi

File="${File_png%.*}"

convert "$File_png" "$File.pnm"        # PNG to PNM
potrace "$File.pnm" -s -o "$File.svg"  # PNM to SVG
rm "$File.pnm"                         # Remove PNM

One-line command

If you want to convert many files, you can also use the following one-line command:

( set -x ; for f_png in *.png ; do f="${f_png%.png}" ; convert "$f_png" "$f.pnm" && potrace "$f.pnm" -s -o "$f.svg" ; done )

See also

See also this good comparison of raster to vector converters on Wikipedia.

回答3:

A png is a bitmap image style and an SVG is a vector-based graphics design which supports bitmaps so it's not as if it would convert the image to vectors, just an image embedded in a vector-based format. You could do this using http://www.inkscape.org/ which is free. It would embed it, however it also has a Live Trace like engine which will try to convert it to paths if you wish (using potrace). See live trace in adobe illustrator (commericial) is an example:

http://graphicssoft.about.com/od/illustrator/ss/sflivetrace.htm

回答4:

You may want to look at potrace.

回答5:

Easy

1. Download Inkscape (it's completely free)
2. Follow the instructions in this short youtube video

As you'll see, if you want to do a whole lot of other clever .svg stuff you can do it using Inkscape also.

A non-technical observation: I personally prefer this method over "free" website offerings because, aside from often requiring registration, by uploading the image, in all practical terms, one is giving the image to the website owner.

回答6:

with adobe illustrator:

Open Adobe Illustrator. Click "File" and select "Open" to load the .PNG file into the program.Edit the image as needed before saving it as a .SVG file. Click "File" and select "Save As." Create a new file name or use the existing name. Make sure the selected file type is SVG. Choose a directory and click "Save" to save the file.

or

online converter http://image.online-convert.com/convert-to-svg

i prefer AI because you can make any changes needed

good luck

回答7:

To my surprise, potrace it turns out, can only process black and white. That may be fine for you use case, but some may consider lack of color tracing to be problematic.

Personally, I've had satisfactory results with Vector Magic

Still it's not perfect.

回答8:

A note to those using potrace and imagemagick, converting PNG images with transparency to PPM doesn't seem to work very well. Here is an example that uses the -flatten flag on convert to handle this:

sudo apt-get install potrace imagemagick
convert -flatten input.png output.ppm
potrace -s output.ppm -o output.svg
rm output.ppm

Another interesting phenomenon is that you can use PPM (256*3 colors, ie. RGB), PGM (256 colors, ie. grayscale) or PBM (2 colors, ie. white or black only) as the input format. From my limited observations, it would appear that on images which are anti-aliased, PPM and PGM (which produce identical SVGs as far as I can see) shrink the colored area and PBM expands the colored area (albeit only a little). Presumably this is the difference between a pixel > (256 / 2) test and a pixel > 0 test. You can switch between the three by changing the file extension, ie. the following use PBM:

sudo apt-get install potrace imagemagick
convert -flatten input.png output.pbm
potrace -s output.pbm -o output.svg
rm output.pbm

回答9:

You can also try http://image.online-convert.com/convert-to-svg

I always use it for my needs.

回答10:

I just found this question and answers as I am trying to do the same thing! I did not want to use some of the other tools mentioned. (Don't want to give my email away, and don't want to pay). I found that Inkscape (v0.91) can do a pretty good job. This tutorial is quick to and easy to understand.

Its as simple as selecting your bitmap in Inkskape and Shift+Alt+B.

回答11:

Depending on why you want to convert from .png to .svg, you may not have to go through the trouble. Converting from .png (raster) to .svg (vector) can be a pain if you are not very familiar with the tools available, or if you are not a graphic designer by trade.

If someone sends you a large, high resolution file (e.g. 1024x1024), you can resize that down to pretty much any size you want in GIMP. Often, you will have problems resizing an image if the resolution (number of pixels per inch) is too low. To rectify this in GIMP, you can:

1. File -> Open: your .png file
2. Image -> Image Properties: check the Resolution, and the color space. You want a resolution around 300 ppi. In most cases you want the color space to be RGB.
3. Image -> Mode: set to RGB
4. Image -> Scale Image: leave the size alone, set and Y resolution to 300 or greater. Hit Scale.
5. Image -> Scale Image: the resolution should now be 300 and you can now resize the image down to pretty much any size you want.

Not as easy as resizing a .svg file, but definitely easier and faster than trying to convert a .png to a .svg, if you already have a big, high-resolution image.

回答12:

I'm assuming that you wish to write software to do this. To do it naively you would just find lines and set the vectors. To do it intelligently, you attempt to fit shapes onto the drawing (model fitting). Additionally, you should attempt to ascertain bitmaped regions (regions you can't model through shames or applying textures. I would not recommend going this route as that it will take quite a bit of time and require a bit of graphics and computer vision knowledge. However, the output will much and scale much better than your original output.

回答13:

http://online-converting.com/image/convert-to-svg/ worked well for converting to svg

回答14:

This tool is working very well right now.

http://www.mobilefish.com/services/image2svg/image2svg.php

回答15:

If you're on some Linux system, imagemagick is perfect. I.e

convert somefile.png somefile.svg

This works with heaps of different formats.

For other media such as videos and audio use (ffmpeg) I know you clearly stated png to svg, however; It's still media related.

ffmpeg -i somefile.mp3 somefile.ogg

Just a tip for if you wish to go through lots of files; a loop using basic shell tricks..

for f in *.jpg; do convert $f ${f%jpg}png; done

That removes the jpg and adds png which tells convert what you want.

来源：https://stackoverflow.com/questions/1861382/how-to-convert-a-png-image-to-a-svg