OK, now you got me started. I took an old pic, and used only filters under the "other" menu item
https://www.cambridgeincolour.com/fo...2&d=1301438590
Extreme noise reduction before I started.
Ran a copy of the background image through "other->minimum" to sort of spread out the color into patches as if applied by a brush.
Found lines as described above. The technique is sort of an inverse version of standard "High Pass" sharpening.
Bingo.
The thing about using the "other" filters is that you get more control over the result.
So far I have identified three things that make a photo painterly.
- Zero noise in a painting.
- Paintings sharpen with dark(e.g. pencil lines), photos sharpen with (hopefully subtle) halos.
- Minimum unit of a color in a photo is a pixel, in a painting, it is a brush stroke. (modest simplification)
Using these observations and the "other filters", I worked out how to do the above.
Another thing... Drawings usually have infinite depth of field.