This script takes a PNG image and converts it into a monochrome SVG. It does this by checking where neighboring pixels are sufficiently different and, where appropriate, drawing a line between them.
Any transparent pixels in the image are converted to a specified color (convert_transparent_to_color). They become white by default.
You can adjust the detection threshold for differences between neighboring pixels (DIFFERENCE_THRESHOLD). Images are converted to grayscale during processing so they will have a value between 0 (black) and 100 (white). If two adjacent pixels are sufficiently different then a line will be drawn between them. This behavior is illustrated below (values not to scale):
SVG images can be resized without any information being lost, but drawsvg allows for some nominal scaling so that option is made available to the user. Set OUTPUT_SCALE at the top of the script. By default the output image size will match the input.
An example of how this script might be used is shown below. I found that commonly used PNG-to-SVG conversion utilities made a mess of pixel art. This script draws clean lines in a grid pattern—nothing more, nothing less.
To use:
- Required dependencies are
OpenCV,Numpy, anddrawsvg. If you don't have them installed or you're using old versions, runpip3 install -r requirements.txt. - Set image path and desired options at the top of
main.pyand run.