Erosion and dilatation are inverted

[Xstoudi]

Consider the following image.

Run this script in the same folder:

const { readSync, writeSync } = require('image-js')

const image = readSync('image.png').grey().threshold({algorithm: 'otsu'})
writeSync('image-threshold.png', image)
writeSync('image-eroded.png', image.erode())
writeSync('image-dilated.png', image.dilate())

Outputed image are the following.

image.erode():

image.dilate():

[Xstoudi]

My bad I obviously inverted white and black meaning myself. Nothing problematic here.