barcode format code [filename] [flags]
| /a | annotation in PNG file |
| /b | bottom margin |
| /d | DPI resolution |
| /e | extra spacing between text chars |
| /f | text font size |
| /g | gap between bar and text |
| /h | height of bar |
| /l | left margin |
| /m | mirror |
| /o | outer border |
| /q | use 4 bit quality |
| /r | right margin |
| /s | scale |
| /t | top margin |
| /v | verbose caption |
| /z | rotate 0, 90, 180 or 270 degrees |
| /0 | background color |
| /1 | foreground color |