bugs - "Boundary" thickness in HighlightImage

Bug introduced in 11 or earlier and persisting through 11.3

CASE:4076121

I'm having a hard time to understand how I can use HighlightImage and only draw the boundary of a binary image with a thickness of exactly one pixel. The documentation suggests that I can use

HighlightImage[
 img,
 {{"Boundary", thickness}, Binarize[img]}
]

but that doesn't work properly. Here is a small example that shows the behavior on Mathematica 11.3 on OS X

img = Import["http://i.stack.imgur.com/DLGJC.png"];
Manipulate[
 With[{img = ImageResize[img, size]},
  Show[HighlightImage[
    img,
    {{"Boundary", thickness}, Binarize[img]}
    ], ImageSize -> 1024
   ]
  ], {size, 100, 500, 1}, {thickness, .1, 10}
 ]

As you will see, the thickness setting has no influence and if you scale the image up with the size slider, then the boundary thickness covers many pixels

Mathematica graphics

Comments

functions - Get leading series expansion term?

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