NOTE: As if version 6.3.0, ShowEQ now includes support for loading multiple map layers automatically and also does the necessary color conversion. So you probably don't need to bother with this script anymore unless you're using an old SEQ version for compatibility with an emu server.
I updated Razzle's original mapconvert script to work correctly with Brewall's and Good's maps. Enjoy!
Updates:
2021-02-25: fix for depth filtering issues