Edges
Difference of Gaussians
Difference of Gaussians: the base of every pencil look.
Controls
- radius
- The size of detail the two blurs are set apart by. Small finds hairs, large finds shapes
- ratio
- How much wider the second blur is than the first. Near one the two nearly cancel and only the finest detail is left
- gain
- Stretches a very small difference across the whole scale, so the threshold below has room to work. Not brightness
- threshold
- Where between paper and ink the line is drawn. Half the scale means no difference at all
- softness
- Half-width of the soft band around the threshold. At zero the decision goes hard and the picture becomes two colours
- 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.