increase spacing between bars?

the barcodes aren't very readable on my labels, due to the low quality of my label printer.
because of this, i'm looking for a way to increase the spacing between bars, or, change the width ratio between bars and spaces.
if this is possible, i really wish to know how!

No file, test, or entry point is named in the issue. Start by examining the JavaScript barcode-generation code and existing tests to locate how bar and space widths are represented. Done would require a clearly defined, documented way to control spacing or the bar-to-space ratio, with tests covering the resulting output.

Written by the indexing model from the issue text.