Easier definition of custom units #51
Description
The software is already very helpful for me (many thanks for sharing it) but I'd like to suggest an improvement. Currently, to define a custom unit one has to specify the number of pixels equal to 1 mm or other unit of choice. It would be way faster if there was an option to specify the number of pixels and the corresponding number of millimeters or other units and let the software do the division. So something like "x pixels equals x [unit]" in addition to "x pixels equals 1 [unit]":
