Convert SVG to PNG in Python

Question

How do I convert an svg to png  in Python  I am storing the svg in an instance of StringIO  Should I use the pyCairo library  How do I write that code

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I m using Wand-py  an implementation of the Wand wrapper around ImageMagick  to import some pretty advanced SVGs and so far have seen great results   This is all the code it takes       with wand image Image  blob svg file read    format  svg    as image          png image   image make blob  png     I just discovered this today  and felt like it was worth sharing for anyone else who might straggle across this answer as it s been a while since most of these questions were answered   NOTE  Technically in testing I discovered you don t even actually have to pass in the format parameter for ImageMagick  so  with wand image Image  blob svg file read     as image  was all that was really needed   EDIT  From an attempted edit by qris  here s some helpful code that lets you use ImageMagick with an SVG that has a transparent background   from wand api import library import wand color import wand image  with wand image Image   as image      with wand color Color  transparent   as background color          library MagickSetBackgroundColor image wand                                            background color resource       image read blob svg file read    format  svg       png image   image make blob  png32    with open output filename   wb   as out      out write png image

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Here is what I did using cairosvg   from cairosvg import svg2png  svg code            lt svg xmlns  http   www w3 org 2000 svg  width  24  height  24  viewBox  0 0 24 24  fill  none  stroke   000  stroke-width  2  stroke-linecap  round  stroke-linejoin  round  gt           lt circle cx  12  cy  12  r  10   gt           lt line x1  12  y1  8  x2  12  y2  12   gt           lt line x1  12  y1  16  x2  12  y2  16   gt       lt  svg gt       svg2png bytestring svg code write to  output png     And it works like a charm   See more  cairosvg document

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The answer is  pyrsvg  - a Python binding for librsvg   There is an Ubuntu python-rsvg package providing it  Searching Google for its name is poor because its source code seems to be contained inside the  gnome-python-desktop  Gnome project GIT repository   I made a minimalist  hello world  that renders SVG to a cairo surface and writes it to disk   import cairo import rsvg  img   cairo ImageSurface cairo FORMAT ARGB32  640 480   ctx   cairo Context img      handle   rsvg Handle  lt svg filename gt     or  for in memory SVG data  handle  rsvg Handle None  str  lt svg data gt     handle render cairo ctx   img write to png  svg png     Update  as of 2014 the needed package for Fedora Linux distribution is  gnome-python2-rsvg  The above snippet listing still works as-is

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Here is an approach where Inkscape is called by Python     Note that it suppresses certain crufty output that Inkscape writes to the console  specifically  stderr and stdout  during normal error-free operation  The output is captured in two string variables  out and err   import subprocess                 May want to use subprocess32 instead  cmd list       full path to inkscape    -z                  --export-png     path to output png                 --export-width   100                --export-height   100                 path to input svg       Invoke the command   Divert output that normally goes to stdout or stderr  p   subprocess Popen  cmd list  stdout subprocess PIPE  stderr subprocess PIPE      Below   lt  out  gt  and  lt  err  gt  are strings or  lt  None  gt   derived from stdout and stderr  out  err   p communicate          Waits for process to terminate    Maybe do something with stdout output that is in  lt  out  gt    Maybe do something with stderr output that is in  lt  err  gt   if p returncode      raise Exception   Inkscape error       err or           For example  when running a particular job on my Mac OS system  out ended up being   Background RRGGBBAA  ffffff00 Area 0 0 339 339 exported to 100 x 100 pixels  72 4584 dpi  Bitmap saved as   path to output png    The input svg file had a size of 339 by 339 pixels

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I did not find any of the answers satisfactory  All the mentioned libraries have some problem or the other like Cairo dropping support for python 3 6  they dropped Python 2 support some 3 years ago    Also  installing the mentioned libraries on the Mac was a pain    Finally  I found the best solution was svglib   reportlab  Both installed without a hitch using pip and first call to convert from svg to png worked beautifully  Very happy with the solution   Just 2 commands do the trick   from svglib svglib import svg2rlg from reportlab graphics import renderPM drawing   svg2rlg  my svg   renderPM drawToFile drawing   my png   fmt  PNG     Are there any limitations with these I should be aware of

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Another solution I ve just found here How to render a scaled SVG to a QImage   from PySide QtSvg import   from PySide QtGui import     def convertSvgToPng svgFilepath pngFilepath width       r QSvgRenderer svgFilepath      height r defaultSize   height   width r defaultSize   width       i QImage width height QImage Format ARGB32      p QPainter i      r render p      i save pngFilepath      p end     PySide is easily installed from a binary package in Windows  and I use it for other things so is easy for me    However  I noticed a few problems when converting country flags from Wikimedia  so perhaps not the most robust svg parser renderer

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Try this  http   cairosvg org   The site says      CairoSVG is written in pure python and only depends on Pycairo  It is   known to work on Python 2 6 and 2 7    Update November 25  2016      2 0 0 is a new major version  its changelog includes          Drop Python 2 support

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Install Inkscape and call it as command line       INKSCAPE PATH  -z -f   source svg  -w   width  -j -e   dest png    You can also snap specific rectangular area only using parameter -j  e g  co-ordinate   0 125 451 217     INKSCAPE PATH  -z -f   source svg  -w   width  -j -a   coordinates  -e   dest png    If you want to show only one object in the SVG file  you can specify the parameter -i with the object id that you have setup in the SVG  It hides everything else     INKSCAPE PATH  -z -f   source svg  -w   width  -i   object  -j -a   coordinates  -e   dest png

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Actually  I did not want to be dependent of anything else but Python  Cairo  Ink    etc   My requirements were to be as simple as possible  at most  a simple pip install  quot savior quot  would suffice  that s why any of those above didn t suit for me  I came through this  going further than Stackoverflow on the research   https   www tutorialexample com best-practice-to-python-convert-svg-to-png-with-svglib-python-tutorial  Looks good  so far  So I share it in case anyone in the same situation

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SVG scaling and PNG rendering  Using pycairo and librsvg I was able to achieve SVG scaling and rendering to a bitmap  Assuming your SVG is not exactly 256x256 pixels  the desired output  you can read in the SVG to a Cairo context using rsvg and then scale it and write to a PNG   main py  import cairo import rsvg  width   256 height   256  svg   rsvg Handle  cool svg   unscaled width   svg props width unscaled height   svg props height  svg surface   cairo SVGSurface None  width  height  svg context   cairo Context svg surface  svg context save   svg context scale width unscaled width  height unscaled height  svg render cairo svg context  svg context restore    svg surface write to png  cool png     RSVG C binding  From the Cario website with some minor modification  Also a good example of how to call a C-library from Python  from ctypes import CDLL  POINTER  Structure  byref  util from ctypes import c bool  c byte  c void p  c int  c double  c uint32  c char p   class  PycairoContext Structure        fields       PyObject HEAD   c byte   object   basicsize                       ctx   c void p                     base   c void p     class  RsvgProps Structure        fields       width   c int     height   c int                     em   c double     ex   c double     class  GError Structure        fields       domain   c uint32     code   c int     message   c char p     def  load rsvg rsvg lib path None  gobject lib path None       if rsvg lib path is None          rsvg lib path   util find library  rsvg-2       if gobject lib path is None          gobject lib path   util find library  gobject-2 0       l   CDLL rsvg lib path      g   CDLL gobject lib path      g g type init        l rsvg handle new from file argtypes    c char p  POINTER POINTER  GError        l rsvg handle new from file restype   c void p     l rsvg handle render cairo argtypes    c void p  c void p      l rsvg handle render cairo restype   c bool     l rsvg handle get dimensions argtypes    c void p  POINTER  RsvgProps        return l    librsvg    load rsvg     class Handle object       def   init   self  path           lib    librsvg         err   POINTER  GError            self handle   lib rsvg handle new from file path encode    byref err           if self handle is None              gerr   err contents             raise Exception gerr message          self props    RsvgProps           lib rsvg handle get dimensions self handle  byref self props        def get dimension data self           svgDim   self RsvgDimensionData            librsvg rsvg handle get dimensions self handle  byref svgDim           return  svgDim width  svgDim height       def render cairo self  ctx              Returns True is drawing succeeded             z    PycairoContext from address id ctx           return  librsvg rsvg handle render cairo self handle  z ctx

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A little extension on the answer of jsbueno      usr bin env python  import cairo import rsvg from xml dom import minidom   def convert svg to png svg file  output file         Get the svg files content     with open svg file  as f          svg data   f read          Get the width   height inside of the SVG     doc   minidom parse svg file      width   int  path getAttribute  width   for path                  in doc getElementsByTagName  svg    0       height   int  path getAttribute  height   for path                   in doc getElementsByTagName  svg    0       doc unlink          create the png     img   cairo ImageSurface cairo FORMAT ARGB32  width  height      ctx   cairo Context img      handler   rsvg Handle None  str svg data       handler render cairo ctx      img write to png output file   if   name         main         from argparse import ArgumentParser      parser   ArgumentParser        parser add argument  -f    --file   dest  svg file                           help  SVG input file   metavar  FILE       parser add argument  -o    --output   dest  output   default  svg png                           help  PNG output file   metavar  FILE       args   parser parse args        convert svg to png args svg file  args output

[python] Convert SVG to PNG in Python

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