Heads...(Threshold fun).

[Ofnuts]

(09-22-2018, 11:27 AM)Espermaschine Wrote: okay...so you make the selection with the Histogram window open, adjust and watch the Histogram change until it hits the middle (128), right ?
and this action splits the grays 50/50...why is that something we want ?selection to path process) ?

Try this:

• Use a black on white image (circle selection, or text)
  
• Color-Select black with a low threshold (15 or less). Note in passing that the selection contains only very dark pixels (max value around 40). Select->To path (rename the path)
  
• Color-Select black with a threshold sufficient to include some pixels above. Select->To path (rename the path)
  
• Make both paths visible: they are different
  
• For each path, Select>To path and bucket-fil with black, set to Difference mode to compare with initial imagel
  

See attached image:
  ThresholdForPath.xcfgz (Size: 48.88 KB / Downloads: 266)

(09-22-2018, 11:27 AM)Espermaschine Wrote: isnt the cleanup phase done by the conversion to path (which is really some kind of inaccuracy of the selection to path process) ?

Yes, the path algorithm filters out the small details.