Since

transform(source : Bitmap)

only takes a single parameter, you can omit that and use

it

so it's

.transform {/* do stuff with 'it' */}.into(this)

val circle = CircleTransformation(); Picasso.with(this.getContext()) .load(R.drawable.display_pic_gtm) .centerCrop() .fit() .transform(circle) .into(this) My bad i don't know how to create an object .