Plugins: Pyrograph

Pyrograph take an image and create a variable feed path to create nice drawing using a professional pyrograph or also a simple solder as tool.

It need PIL/Pillow so that it can load picture and read the brightness to modulate the speed of the tool to burn more or less the material.
The more the image is dark the slower the speed.

The list of parameters:

Pyrograph tip size : it will define the distance from one scan line and the other
Working depth : all path will be generated with this Z height.
Maximum size : The maximum image size (width or height) will be convert to this real measure. The other will be calculated to maintain the aspect ratio.
Minimum feed : for the darkest zones
Maximum feed : for the brighter zones
Direction : Horizontal scan, Vertical scan or Both (first vertical then horizontal)
Draw border : If checked it will generate a rectangle path at lower feed over the border of the image
Image to process : when clicked will open a browse dialog to select an image to process.

Tuning parameters require some test and try. A good starting point are the default values, nice for a solder of 30 Watt power and a flat 2 mm tip. So 250mm/min for the darkest part of the image and 5000 mm/min for the brighter map. The tooltip size is set to 0.5 , in this way the tip pass over the previous path and merge the results. Here a test with some defect using both directions (vertical and horizontal path).

Pyrograph test