> When I receive the label image from them, it comes 1400x950 at 72dpi.

What format is the label image in?  Ideally you would want to receive it as
Postscript or PDF or some other vector format which can be drawn at whatever
scale you need.  If its an image, ideally you would reduce the size at
50%

  convert source3.png -filter point -resize 50% final3.png

The point filter is used to sample the image at integer locations so not
blurring is introduced.  To reduce it to 618 use

  convert source3.png -filter point -resize 618x618 final3.png

but that introduces non-uniform sampling which may cause the bar code to
not register properly.
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