The plugin uses island similarity detection in the following situations:

  • Select Similar operator – selects all islands which have similar shape to islands which are already selected.
  • Align Similar operator – aligns selected islands, so islands which are similar are placed on top of each other grouping islands by similarity.
Similarity operators in the Advanced Options panel

Accuracy of similarity detection depends on two factors:

  • Similarity Threshold parameter: a greater value of this parameter means islands will be more likely recognized as a similar in shape. A lower value means more accurate distinction. 0.5 is a good threshold value to start with.

  • Precision parameter: more precision means better accuracy in looking for similar islands. Precision set to 200 should be sufficient in most cases. This value should be increased in the first place, when dealing with really small islands.