SVG2PNG

Introduction

If you want to convert SVG files repeatedly, it is bothering to open and save files each time. Then CairoSVG is a good python library for converting SVG to PNG. But building a python environment is also bothering me, so this repository manages the following things.

• Dockerfile for environment to use python and CairoSVG
• python code for batch file conversion
• Memorandum for docker commands

Installation

1. Install docker.
2. Build Dockerfile with following command.

docker build -t python-cairosvg:latest .

Usage

Single file conversion on macOS

1. Run docker image with mounting current directory as working directory.

docker run --rm -it -v $(pwd):/var/python python-dl bash

2. Put SVG file (ex. image.svg) to src directory.

3. Run cairosvg command.

cairosvg src/image.svg -o dst/image.png

Multiple file conversion on macOS

1. Run docker image with mounting current directory as working directory.

docker run --rm -it -v $(pwd):/var/python python-cairosvg bash

2. Put SVG files (ex. image.svg) to src directory.

3. Run python script.

python convert.py

4. All SVG files inside ./src will be converted and saved to ./dst

Cleanup old build after updating Dockerfile

If you build Dockerfile after updating it, the previous build may remain like following log.

$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED              SIZE
python-dl           latest              c6d6f509ae5b        3 seconds ago        1.21GB
<none>              <none>              6e119ff05b9e        About a minute ago   1.21GB  <- Previous build
python              latest              a4cc999cf2aa        2 days ago           929MB

Then you can cleanup these images by following command.

docker rmi $(docker images -qa -f 'dangling=true')