Edges
Canny
Canny with non-maximum suppression: one-pixel edges, no doubles.
Controls
- blur
- Softens the picture before edges are found, which is also what picks the size of edge worth keeping
- high
- The strength at which an edge is certainly an edge. Everything above this starts a line
- low ratio
- The weaker threshold, as a share of the strong one. A weak edge lives only where it touches a strong one — that is what keeps thin branches
- thickness
- Line width in output pixels. The tracing does not change — only the pen
- contrast
- A number from -1 to 1, 0 by default.
- invert
- On or off, off by default.
- ink
- A colour, #ffffff by default.
- paper
- A colour, #000000 by default.