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.
