Name Value
rasterNumNone 0
Only the prefix and postfix strings are sent to the device, not the number itself.
rasterNumDirect 1
This pads the number to 'minwidth' (minwidth is a field in the ropt struct) bytes by appending 0s to the front of the number, and then puts the hex data into the stream.
rasterNumToAscii 2
This is similar to rasterNumDirect (above), except the number is converted to
ASCII and then front-padded with the pad character specified to make it
minwidth characters long. For example, the ImageWriter requires four-digit
numbers, so minwidth would be set to four, the padchar would be 0, and this
attribute would be set.