How to set the background color when rendering a PNG using PythonMagick

Question

I'm trying to render an SVG->PNG using PythonMagick, but it seems that the background color is ignored.

Using the ImageMagick command, things work as expected:

tmp$ convert -background none access.svg access.png
tmp$ convert -background red access.svg access2.png

which results in transparent and red backgrounds respectively.

But using PythonMagick, it seems the background color is ignored:

import PythonMagick
svg = PythonMagick.Image('access.svg')
svg.backgroundColor().to_std_string()
'#FFFFFFFFFFFF'
svg.backgroundColor().alpha()
0.0
svg.backgroundColor('none')
svg.backgroundColor().to_std_string()
'#0000000000000000'
svg.backgroundColor().alpha()
1.0
svg.write('access.png')
svg.backgroundColor('red')
svg.backgroundColor().to_std_string()
'#FFFF00000000'
svg.backgroundColor().alpha()
0.0
svg.write('access2.png')

Checking the output shows that both pngs have a white background. Is there another way to set the background color so that it is recognised when writing the image?

Answer 1

ImageMagick (and PythonMagick as its python API) has very poor SVG support. Do not even expect that it will render SVG file as it is written in the SVG specification. It converts SVG into internal MVG language and then converts to PNG. See http://www.imagemagick.org/script/magick-vector-graphics.php

ImageMagick is not a tool for manipulating vector graphics.