If you don't repaint.. Learn!

I'm here to tell ya.. If I can do it ANYONE CAN! 

Flight Simulator and other chat
https://forums.simviation.com/phpBB3/
https://forums.simviation.com/phpBB3/viewtopic.php?f=20&t=58555
All you need to do this, is download a free copy of a (.bmp converter) I'm not sure
where to get one now-a-days, the one I used seems to be 'not available' anymore
but i'm sure you will find one out there somewhere.
the compression uses less steps so the fine gradient becomes blotchy as values are combined due the less information a compressed file contains.