Detached outline

Hi, I would add a stroke of a few pixels wide, either in black, whose blending mode you would set to Screen, (or white set to multiply...) then add another stroke, with the + button, set it to black, in normal blending mode this time, and increase its size value to be bigger than the first one.

The only issue you would have is that the stroke setting is in pixels, you have to know the resolution to compute the correct amount of pixels (at 100 ppi, .25in would be 25px, 200ppi, .25 would be 50 px, etc.)

A Shape Burst Stroke might be an option. 

Edit: I changed the screenshot, I had accidentall set the Stroke to Center indtead of Outside. 

And as @jane-e already pointed out: png is not a vector image format. 

---

@jacquelineh11943948 wrote:

vector image (png) 

 

---

A png is raster, not vector. It looks like it was originally created as vector (with anchor points), but it became raster when saved as a png (pixels). Do you have the vector version and Illustrator? If not, try the workaround already given.

~ Jane

Double click layer to own stylize box. Go stroke add 0.25 stroke> select the color you would like the stroke.

If you have a vector it maybe easier to do this in illustrator.