The term Healing Clone is unclear to me. The sentence: A percent of 0 has no effect, and the prush just copies above than 0 represents a ratio mixing the destination color with source. is also unclear. Should prush be brush? but what follows is still unclear.
It was brush yes and fixed, the current description might be clearer. It's just updated to: A percent of 0 has no effect, values above 0 represent a factor for mixing the destination color with source color this is done radially i.e. the inner part of the brush radius is totally from source and mixing with destination is done gradually till the outer part of the circle. The idea of the tool was suggested by digiKam users for a long time, is to remove spots, such as dust spots from image using some other location of the same image this is the clone idea, the term healing is to describe the feature of radial mixing that means mixing of the copied part exterior with the original color of the spot surrounding making the clone less sharp and more natural.
Closing the report.