On 14/3/24 17:47, jeremy ardley wrote:
For reference on a 203 DPI (8 dots per mm) printer, a GS1-128 barcode takes up 12 modules per character. The minimum size of a module is 1 pixel so 1 character is 12 pixels wide or 1.2mm on a 203 dpi printer.Assuming a 40 character barcode at 1 pixel per module, it will span 48mm.However it is very unusual to have 1 pixel per module. Instead at 2 pixels per module the barcode is 96mm and at 3 pixels it will be 144mm
My error; The character spacing is 1.5mm at 203dpi. So 40 characters is 60mm at 1 pixel per module, 120mm at 2 pixels per module, and 180mm at 3 pixels per module. This means for a 40 character barcode you can at best print at 2 pixels per module on a typical 100x150m shipping label. This allows for no errors in quantization of pixel sizes and It's really hard to do with a printing system that does not start and continue with accurate pixel registration.