Use this to adjust the width of barcode bars, in order to compensate for ink bleeding when printing on your substrate.
Your printer or customer will usually provide you with the value to use. For example if your printer tells you that the line width will increase by 0.01mm, you should use a Bar Width Reduction value of 0.01 mm.
You can enter the Bar Width Reduction in microns, milliinches (“mil”), millimeters or inches.